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My publications in astronomy are also accessible online from the SAO/NASA Astrophysics Data Systems (ADS,  Link)

 


 

Books

 

Guenther, E. W., & Geier, S., The Effects of Close-in Exoplanets on Their Host Stars, in: H. Lammer, M. Khodachenko (eds.), Characterizing Stellar and Exoplanetary Environments, Astrophysics and Space Science Library, Vol. 411, 169, Springer, 2015

 

Geier, S.;

Schwellenmacht - Kernenergie und Außenpolitik der Bundesrepublik Deutschland von 1949 bis 1980, Dissertation Universität Erlangen-Nürnberg, Erlangen 2013 (Link)

 

Geier, S.;

Schwellenmacht. Bonns heimliche Atomdiplomatie von Adenauer bis Schmidt, Schöningh Verlag, Paderborn 2013 (Link)

 

Geier, S,;

History of Nuclear Energy in Germany, in: A. Presas i Pruig (ed.), History of Nuclear Energy, Boston Studies in the Philosophy and History of Science, Springer, submitted

 


 

Refereed Journals

 

Geier, S., Østensen, R. H., Nemeth, P., Gentile Fusillo, N. P., Gänsicke, B. T., Telting, J. H., Green, E. M., Schaffenroth, J.;

The population of hot subdwarf stars studied with Gaia I. The catalogue of known hot subdwarf stars, 2017, A&A, in press (arXiv:1612.03135)

 

 Kupfer, T., van Roestel, J., Brooks, J., Geier, S., Marsh, T. R., Groot, P. J., Bloemen, S., Prince, T. A., Bellm, E., Heber, U., Bildsten, L., Miller, A. A., Dyer, M. J., Dhillon, V. S., Green, M., Irawati, P., Laher, R., Littlefair, S. P., Shupe, D. L., Steidel, C. C., Rattansoon, S., Pettini, M.;

PTF1 J082340.04+081936.5: A hot subdwarf B star with a low mass white dwarf companion in an 87 minute orbit, 2017, ApJ, 835, 131

 

 Nemeth, P., Ziegerer, E., Irrgang, A., Geier, S., Fürst, F., Kupfer, T., Heber, U.;

An Extremely Fast Halo Hot Subdwarf Star in a Wide Binary System, 2016, ApJ, 821, L13

  

Reindl, N., Geier, S., Kupfer, T., Bloemen, S., Schaffenroth, V., Heber, U., Barlow, B. N., Østensen, R. H.;

RV variable, hot post-AGB stars from the MUCHFUSS project - Classification, atmospheric parameters, formation scenarios, 2016, A&A, 587, 101

 

Latour, M., Heber, U., Irrgang, A., Schaffenroth, V., Geier, S., Hillebrandt, W., Röpke, F. K., Taubenberger, S., Kromer, M., Fink, M.;

Quantitative spectral analysis of the sdB star HD 188112: A helium-core white dwarf progenitor, 2016, A&A, 585, 155


Kupfer, T., Groot, P. J., Bloemen, S., Levitan, D., Steeghs, D., Marsh, T. R., Rutten, R. G. M., Nelemans, G., Prince, T. A., Fürst, F., Geier, S.;

Phase resolved spectroscopy and Kepler photometry of the ultracompact AM CVn binary SDSS J190817.07+394036.4, 2015, MNRAS, 453, 483

 

Casewell, S. L., Dobbie, P. D., Geier, S., Lodieu, N., Hambly, N. C.;

Optical spectroscopy of candidate Alpha Persei white dwarfs, 2015, MNRAS, 451, 4259

 

Geier, S., Kupfer, T., Heber, U., Schaffenroth, V., Barlow, B. N., Østensen, R. H., O'Toole, S. J., Ziegerer, E., Heuser, C., Maxted, P. F. L., Gänsicke, B. T., Marsh, T. R., Napiwotzki, R., Brünner, P., Schindewolf, M., Niederhofer, F.;

The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project, 2015, A&A, 577, 26

 

Ziegerer, E., Volkert, M., Heber, U., Irrgang, A., Gänsicke, B. T., Geier, S.;

Candidate hypervelocity stars of spectral type G and K revisited, 2015, A&A, 576, L14

 

Randall, S. K., Bagnulo, S., Ziegerer, E., Geier, S., Fontaine, G.;

The enigmatic He-sdB pulsator LS IV -14°116: new insights from the VLT, 2015, A&A, 576, 65

 

Kupfer, T., Geier, S., Heber, U., Østensen, R. H., Barlow, B. N., Maxted, P. F. L., Heuser, C., Schaffenroth, V., Gänsicke, B. T.;

Hot subdwarf binaries from the MUCHFUSS project - Analysis of 12 new systems and a study of the short-period binary population, 2015, A&A, 576, 44

 

Geier, S., Fürst, F., Ziegerer, E., Kupfer, T., Heber, U., Irrgang, A., Wang, B., Liu, Z., Han, Z., Sesar, B., Levitan, D., Kotak, R., Magnier, E., Smith, K., Burgett, W. S., Chambers, K., Flewelling, H., Kaiser, N., Wainscoat, R., Waters, C.;

The fastest unbound star in our Galaxy ejected by a thermonuclear supernova, 2015,  Science, 347, 1126

 

Geier, S.;

Hot subdwarfs: Small stars marking important events in stellar evolution. Ludwig Biermann Award Lecture 2014, 2015, Reviews in Modern Astronomy 27, Astronomical Notes, 336, 437

 

Scholz, R.-D., Heber, U., Heuser, C., Ziegerer, E., Geier, S., Niederhofer, F.;

An ancient F-type subdwarf from the halo crossing the Galactic plane, 2015, A&A, 574, 96 

 

Schaffenroth, V., Classen, L., Nagel, K., Geier, S., Koen, C., Heber, U., Edelmann, H.;

Two candidate brown dwarf companions around core helium-burning stars, 2014, A&A, 570, 70

 

Telting, J. H., Baran, A. S., Nemeth, P., Østensen, R. H., Kupfer, T., Macfarlane, S., Heber, U., Aerts, C., Geier, S.;

KIC7668647: a 14 day beaming sdB+WD binary with a pulsating subdwarf, 2014, A&A, 570, 129

 

Mereghetti, S., La Palombara, N., Esposito, P., Gastaldello, F., Tiengo, A., Heber, U., Geier, S., Wilms, J.;

Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30 11223 and PG 1232-136, 2014, MNRAS, 441, 2684

 

Randall, S. K., Fontaine, G., Geier, S., van Grootel, V., Brassard, P.;

Mode identification based one time-series spectrophotometry for the bright rapid sdB pulsator EC 01541-1409, 2014, A&A, 563, 79

 

Schaffenroth, V., Geier, S., Heber, U., Kupfer, T., Ziegerer, E., Heuser, C., Classen, L., Cordes, O.;

Binaries discovered by the MUCHFUSS project: SDSS J162256.66+473051.1 – An eclipsing subdwarf B binary with a brown dwarf companion, 2014, A&A, 564, 98

 
Maxted, P. F. L., Bloemen, S., Heber, U., Geier, S., Wheatley, P. J., Marsh, T. R., Breedt, E., Sebastian, D., Faillace, G., Owen, C., Pulley, D., Smith, D., Kolb, U., Haswell, C. A., Southworth, J., Anderson, D. R., Smalley, B., Collier Cameron, A., Hebb, L., Simpson, E. K., West, R. G., Bochinski, J., Busuttil, R., Hadigal, S.;

EL CVn-type binaries – Discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems, 2014, MNRAS, 437, 1681


Geier, S., Østensen, R. H., Heber, U., Kupfer, T., Maxted, P. F. L., Barlow, B. N., Vuckovic, M., Tillich, A., Müller, S., Edelmann, H., Classen, L., McLeod, A. F.;

Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions, 2014, A&A, 526, 95

 

Geier, S., Heber, U., Edelmann, H., Morales-Rueda, L., Kilkenny, D., O'Donoghue, D., Marsh, T. R., Copperwheat, C.;

Hot subdwarf stars in close-up view IV. Helium abundances and the 3He isotopic anomaly of subdwarf B star, 2013, A&A, 557, 122

 

Østensen, R. H., Geier, S., Schaffenroth, V., Beck, P., Bloemen, S., Lombaert, R., Nemeth, P., Papics, P. I., Tillich, A., Telting, J. H., Fox Machado, L., Littlefair, S., Aerts, C., Heber, U., Maxted, P. F. L., Gänsicke, B. T., Marsh, T. R., Napiwotzki, R.;

Binaries discovered by the MUCHFUSS project – FBS 0117+396: An sdB+dM binarywith a pulsating primary, 2013, A&A, 559, 35

 

Geier, S., Marsh, T. R., Wang, B., Dunlap, B., Barlow, B. N., Schaffenroth, V., Chen, X., Irrgang, A., Maxted, P. F. L., Ziegerer, E., Kupfer, T., Miszalski, B., Heber, U., Han, Z., Shporer, A., Telting, J. H., Gänsicke, B. T., Østensen, R. H., O'Toole, S. J., Napiwotzki, R.;

A progenitor binary and an ejected mass donor remnant of faint type Ia supernovae, 2013, A&A, 554, 54

 

Schaffenroth, V., Geier, S., Drechsel, H., Heber, U., Wils, P., Østensen, R. H., Maxted, P. F. L., di Scala, G.;

A new bright eclipsing hot subdwarf binary from the ASAS and SuperWASP surveys, 2013, A&A, 553, 18  

 

Geier, S., Heber, U., Heuser, C., Classen, L., O'Toole, S. J., Edelmann, H.;

The subdwarf B star SB 290 – A fast rotator on the extreme horizontal branch, 2013, A&A, 551, L4

 

Geier, S.;

Hot subdwarf stars in close-up view – III. Metal abundances of subdwarf B stars, 2013, A&A, 549, 110

 

Barlow, B. N., Kilkenny, D., Drechsel, H., Dunlap, B. H., O'Donoghue, D., Geier, S., O'Steen, R. G., Clemens, J. C., LaCluyze, A. P., Reichart, D. E., Haislip, J. B., Nysewander, M. C., Ivarsen, K. M.;

EC 10246-2707: a new eclipsing sdB+M dwarf binary, 2013, MNRAS, 430, 22

 

Naslim, N., Geier, S., Jeffery, C. S., Behara, N. T., Woolf, V. M., Classen, L.;

The helium-rich subdwarf CPD -20°1123: a post-common-envelope binary on to the extended horizontal branch, 2012, MNRAS, 423, 3031

 

Geier, S., Heber, U.;

Hot subdwarf stars in close-up view. II. Rotational properties of single and wide binary subdwarf B stars, 2012, A&A, 543, 149

 

Geier, S., Schaffenroth, V., Hirsch, H., Tillich, A., Heber, U., Maxted, P. F. L., Østensen, R. H., Barlow, B. N., O'Toole, S. J., Kupfer, T., Marsh, T. R., Gänsicke, B. T., Napiwotzki, R., Cordes, O., Müller, S., Classen, L., Ziegerer, E.,     Drechsel, H.;

MUCHFUSS - Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS, 2012, AN, 333, 431

 

Sebastian, D., Guenther, E. W., Schaffenroth, V., Gandolfi, D., Geier, S., Heber, U., Deleuil, M., Moutou, C.;  

Multi-object spectroscopy of stars in the CoRoT fields. I. Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02, 2012, A&A, 541, 34

 

Maxted, P. F. L., Anderson, D. R., Burleigh, M. R., Collier Cameron, A., Heber, U., Gänsicke, B. T., Geier, S., Kupfer, T., Marsh, T. R., Nelemans, G., O'Toole, S. J., Østensen, R. H., Smalley, B., West, R. G.;

Discovery of a stripped red giant core in a bright eclipsing binary system, 2011, MNRAS, 418, 1156


Geier, S., Classen, L., Heber, U.;

The Fast-Rotating, Low-gravity Subdwarf B Star EC 22081-1916: Remnant of a Common Envelope Merger Event, 2011, ApJ, 733, L13

 

Geier, S., Schaffenroth, V., Drechsel, H., Heber, U., Kupfer, T., Tillich, A., Østensen, R. H.,Smolders, K., Degroote, P., Maxted, P. F. L., Barlow, B. N., Gänsicke, B. T., Marsh, T. R., Napiwotzki, R.;

Binaries Discovered by the MUCHFUSS Project: SDSS J08205+0008—An Eclipsing Subdwarf B Binary with a Brown Dwarf Companion, 2011, ApJ, 731, L22

 

Geier, S., Napiwotzki, R., Heber, U., Nelemans, G.;

Binaries discovered by the SPY survey. VI. Discovery of a low mass companion to the hot subluminous planetary nebula central star EGB 5 - a recently ejected common envelope? 2011, A&A, 528, L16

 

Tillich, A., Heber, U., Geier, S., Hirsch, H., Maxted, P. F. L., Gänsicke, B. T., Marsh, T. R., Napiwotzki, R., Østensen, R. H., Scholz, R.-D.;

The Hyper-MUCHFUSS project: Probing the Galactic halo with sdB stars, 2011, A&A, 527, 137

 

Geier, S., Maxted, P. F. L., Napiwotzki, R., Østensen, R. H., Heber, U., Hirsch, H., Kupfer, T., Müller, S., Tillich, A., Barlow, B. N., Oreiro, R., Ottosen, T. A., Gänsicke, B. T., Marsh, T. R.;  

Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS). Analysis of seven close subdwarf B binaries, 2011, A&A, 526, 39

 

Geier, S., Hirsch, H., Tillich, A., Maxted, P. F. L., Bentley, S. J., Østensen, R. H., Heber, U., Gänsicke, B. T., Marsh, T. R., Napiwotzki, R., Barlow, B. N., O'Toole, S. J.;

The MUCHFUSS project – Searching for hot subdwarf binaries with massive unseen companions. Survey and target selection for follow-up, 2011, A&A, 530, 28

 

Geier, S., Heber, U., Kupfer, T., Napiwotzki, R.; Binaries discovered by the SPY project .

V. GD 687 - a massive double degenerate binary progenitor that will merge within a Hubble time, 2010, A&A, 515, 37

 

Geier, S., Heber, U., Podsiadlowski, Ph., Edelmann, H., Napiwotzki, R.,     Kupfer, T., Müller, S.;

Hot subdwarf stars in close-up view I. Rotational properties of subdwarf B stars in close binary systems and nature of their unseen companions, 2010, A&A, 519, 25

 

Tillich, A., Geier, S., Heber, U., Hirsch, H., Maxted, P. F. L., Marsh, T., Gänsicke, B., Napiwotzki, R., Østensen, R., Scholz, R.-D.;

The HYPER-MUCHFUSS project—the constant high-velocity population, 2010, Ap&SS,   329, 69

 

Geier, S., Heber, U., Edelmann, H., Morales-Rueda, L., Napiwotzki, R.; 

Metal abundances of subdwarf B stars - the extended sample, 2010, Ap&SS, 329, 127

 

Reed, M. D., Terndrup, D. M., Østensen, R., Geier, S., Gilker, J., Beck, P. G., Degroote, P., Vanautgaerden, J., Waelkens, C.;

An EC 14026 pulsator in a reflection binary, 2010, Ap&SS, 329, 83

 

Geier, S., Heber, U., Tillich, A., Hirsch, H., Edelmann, H., Schaffenroth, V., Kupfer, T., Müller, S., Maxted, P. F. L., Østensen, R., Podsiadlowski, Ph., Marsh, T. R., Gänsicke, B. T., Morales-Rueda, L., Nelemans, G., Napiwotzki, R., Günther, E. W., Carone, L.;

Hot subdwarfs in binary systems and the nature of their unseen companions, 2010, Ap&SS, 329, 91

 

Müller, S., Geier, S., Heber, U.;

The cool companion of AA Doradus – Brown dwarf or late M star? 2010, Ap&SS, 329, 101

 

Tillich, A., Geier, S., Heber, U., Hirsch, H., Maxted, P. F. L., Marsh, T. R., Gänsicke, B. T., Napiwotzki, R., Østensen, R., Scholz, R.-D.;

The HYPER-MUCHFUSS project—target selection and analysis, 2010, Ap&SS, 329, 63

   

Geier, S., Edelmann, H. and Heber, U., Morales-Rueda, L.;

Discovery of a close substellar companion to the hot subdwarf star HD149382 – The decisive influence of substellar objects on late stellar evolution, 2009, ApJ, 702, L96

 

Oreiro, R., Østensen, R. H., Green, E. M., & Geier, S.;

2M0415+0154: a new bright, short-period subdwarf B pulsator, 2009, A&A, 496, 827

 

Telting, J. H., Geier, S., Østensen, R. H., Heber, U., Glowienka, L., Nielsen, T., Nielsen, T.; Oreiro, R.; Frandsen, S.;

Time-resolved high-resolution spectroscopy of the bright pulsating subdwarf B star Balloon 090100001, 2008, A&A, 492, 815

 

Geier, S., Nesslinger, S., Heber, U., Randall, S. K., Edelmann, H., & Green, E. M.;

Tidal synchronisation of the subdwarf B binary PG 0101+039, 2008, A&A, 477, L13

 

Geier, S., Karl, C., Edelmann, H., Heber, U., & Napiwotzki, R.;

Hot Subdwarf Binaries with Heavy Compact Companions - Discovery of a hidden population of evolved neutron stars and black holes? 2007, AN, 328, 708

 

Geier, S., Nesslinger, S., Heber, U., Przybilla, N., Napiwotzki, R., & Kudritzki, R.-P.;

The hot subdwarf B + white dwarf binary KPD 1930+2752. A supernova type Ia progenitor candidate, 2007, A&A, 464, 299

 


 

Conference Proceedings and non-refereed Journals

 

Casewell, S., Geier, S., Lodieu, N.;

 

New White Dwarf-Brown Dwarf Binaries, ASP Conf. Ser., 509, 133

 

 

Geier, S., Kupfer, T., Heber, U., Nemeth, P., Ziegerer, E., Irrgang, A., Schindewolf, M., Marsh, T. R., Gänsicke, B. T., Barlow, B. N., Bloemen, S.;

Close binary progenitors and ejected companions of thermonuclear supernovae, 2017, ASP Conf. Ser., 509, 79

 

Reindl, N., Geier, S., Kupfer, T., Schaffenroth, V., Heber, U., Barlow, B. N., Østensen, R. H.;

Discovery of radial velocity variable post-AGB stars from the MUCHFUSS project, 2015, EAS Pub. Ser., Vol. 71-72, 135

  

Geier, S., Kupfer, T., Schaffenroth, V., Heber, U., & the MUCHFUSS collaboration;

Hot subdwarfs in the Galactic halo - Tracers of prominent events in late stellar evolution, 2016, The General Assembly of Galactic Halos: Structure, Origin and Evolution, Proc. IAU Symposium 317, A. Bragaglia, M. Arnaboldi, M. Rejkuba & D. Romano, eds., 302

 

Geier, S,;

Why do hot subdwarf stars pulsate? 2015, Astronomy in Focus, Vol. 1, XXIXth IAU General Assembly, August 2015. P. Benvenuti, ed., in press (arXiv:1510.05488)

 

Sebastian, D., Guenther, E. W., Heber, U., Geier, S., Grziwa, S.;

Transiting Sub-stellar companions of Intermediate-mass stars, 2015, EPJWC, 10106056

 

Guenther, E. W., Cusano, F., Deeg, H., Gandolfi, D., Geier, S., Grziwa, S., Heber, U., Tal-Or, L., Sebastian, D., Rodler, F.;

A planet in a polar orbit of 1.4 solar-mass star, 2015, EPJWC, 10102001

 

Geier, S., Kupfer, T., Heber, U., Barlow, B. N., Maxted, P. F. L., Heuser, C., Schaffenroth, V., Ziegerer, E., Østensen, R. H., Gänsicke, B. T.;

The Population of White Dwarf Binaries with Hot Subdwarf Companions, 2015, ASP Conf. Ser., 493, 475

  

Gänsicke, B., Tremblay, P.-E., Barstow, M., Bono, G., Burleigh, M., Casewell, S., Dhillon, V., Farihi, J., Garcia-Berro, E., Geier, S., et al.;

Stellar archaeology with Gaia: the Galactic white dwarf population, 2015, ASP Conf. Ser., 507, 159

 

Geier, S.;

Heiße Unterzwerge. Kleine Sterne mit großer Bedeutung, 2015, Sterne und Weltraum,  4/2015, 38

 

Geier, S.;

Fellows at ESO, 2014, The Messenger, 157, 54

 

Arnaboldi, M., Delmotte, N., Geier, S., Mascetti, L., Micol, A., Retzlaff, J., Romaniello, M.;

Phase 3 Status and Access to Science Data Products from ESO Public Surveys, 2014, The Messenger, 156, 24

 

Arnaboldi, M., Rejkuba, M., Retzlaff, J., Delmotte, N., Geier, S., Hanuschik, R., Hilker, M., Hummel, W., Hussain, G., Ivanov, V. D., Micol, A., Mieske, S., Neeser, M., Petr-Gotzens, M., Szeifert, T.;

The ESO Public Surveys - Review of Milestones and Completion, 2014, The Messenger, 154, 18

 

Schaffenroth, V., Geier, S., Barbu-Barna, I., Heber, U., Cordes, O.;

New HW Virginis systems from the MUCHFUSS project, 2014, ASP Conf. Ser., 481, 253

 

Heber, U., Geier, S., Irrgang, A., Schneider, D., Barbu-Barna, I., Mereghetti, S., La Palombara, N.;

The mysterious X-ray sdO binary BD +37°442, 2014, ASP Conf. Ser., 481, 307

 

Kupfer, T., Geier, S., McLeod, A. F., Groot, P. J., Verbeek, K., Schaffenroth, V., Heber, U., Heuser, C., Ziegerer, E., Østensen, R. H., Nemeth, P., Dhillon, V. S., Telting, J. H., Sphorer, A., Fulton, B. J.;

Finding compact hot subdwarf binaries in the Galactic disc, 2014, ASP Conf. Ser., 481, 293

 

Geier, S., Kupfer, T., Barlow, B. N., Schaffenroth, V., Fürst, F., Heuser, C., Ziegerer, E., Heber, U., Marsh, T. R., Maxted, P. F. L., Østensen, R. H., O'Toole, S. J., Gänsicke, B. T., Napiwotzki, R.;

MUCHFUSS - Status and highlights, 2014, ASP Conf. Ser., 481, 243

 

Geier, S.;

Hot Subdwarf Formation: Confronting Theory with Observation, 2013, EPJ Web of Conferences, Volume 43, id.04001

 

Heber, U., Geier, S., Gänsicke, B. T.;

Hot subluminous Stars: Highlights from the MUCHFUSS and Kepler missions, 2013, EPJ Web of Conferences, Volume 43, id.04002

 

Geier, S., Marsh, T. R., Dunlap, B. H., Barlow, B. N., Schaffenroth, V., Ziegerer, E., Heber, U., Kupfer, T., Maxted, P. F. L., Miszalski, B., Shporer, A., Telting, J. H., Østensen, R. H., O'Toole, S. J., Gänsicke, B. T., Napiwotzki, R.;

Discovery of the closest hot subdwarf binary with white dwarf companion, 2013, ASP Conf. Ser., 469, 373

 

Gilmore, G., Randich, S., Asplund, M., ... (Geier, S.), et al.;

The Gaia-ESO Public Spectroscopic Survey, 2012, The Messenger, 147, 25

 

Geier, S., Classen, L., Brünner, P., Nagel, K., Schaffenroth, V., Heuser, C., Heber, U., Drechsel, H., Edelmann, H., Koen, C., O'Toole, S. J., Morales-Rueda, L.;

Low-mass Stellar and Substellar Companions to sdB Stars, 2012, ASP Conf Ser., 452, 153

 

Maxted, P. F. L., Anderson, D. R., Burleigh, M. R., Collier Cameron, A., Heber, U., Gänsicke, B. T., Geier, S., Kupfer, T., Marsh, T. R., Nelemans, G., O'Toole, S. J., Østensen, R. H., Smalley, B., West, R. G.;

Discovery of a stripped red giant core in a bright eclipsing binary system, 2012, ASP Conf. Ser., 452, 137

 

Geier, S., Schaffenroth, V., Hirsch, H., Tillich, A., Heber, U., Classen, L., Kupfer, T., Maxted, P. F. L., Østensen, R. H., Barlow, B. N., O'Toole, S. J., Marsh, T. R., Gänsicke, B. T., Cordes, O., Napiwotzki, R.;

The MUCHFUSS Project: Searching for the Most Massive Companions to Hot Subdwarf Stars in Close Binaries and Finding the Least Massive Ones, 2012, ASP Conf. Ser., 452, 129

 

Chountonov, G., Geier, S.;

HD 76431: An Evolved Hot Subdwarf with Variable Magnetic Field? 2012, ASP Conf Ser., 452, 93

 

Geier, S., Heber, U., Edelmann, H., Napiwotzki, R., Morales-Rueda, L.;

Rotational Properties of Single and Wide Binary Subdwarf B Stars, 2012, ASP Conf. Ser., 452, 81

 

Geier, S., Heber, U., Edelmann, H., Morales-Rueda, L., Kilkenny, D., O'Donoghue, D., Marsh, T. R., Copperwheat, C.;

Helium Abundances of Single and Wide Binary Subdwarf B Stars, 2012, ASP Conf. Ser.,  452, 57

 

Classen, L., Geier, S., Heber, U., O'Toole, S. J.;

Radial Velocity Survey of Low-Mass Companions to sdB Stars, 2010, AIP Conf Ser., 1331, 297 

 

Geier, S., Heber, U., Tillich, A., Hirsch, H., Kupfer, T., Schaffenroth, V., Classen, L., Maxted, P. F. L., Østensen, R. H., Barlow, B. N., Marsh, T. R., Gänsicke, B. T., Napiwotzki, R., O'Toole, S. J., Günther, E. W.;

Substellar Companions and the Formation of Hot Subdwarf Stars, 2011, AIP Conf Ser.,  1331, 163

 

Schaffenroth, V., Geier, S., Heber, U., Drechsel, H., Østensen, R. H., Maxted, P. F. L., Kupfer, T., Barlow, B. N.;

Analysis of two eclipsing hot subdwarf binaries with a low mass stellar and a brown dwarf companion, 2010, AIP Conf Ser.,1314, 91

 

Geier, S., Heber, U., Tillich, A., Hirsch, H., Müller, S., Kupfer, T., Schaffenroth, V., Classen, L., Maxted, P. F. L., Østensen, R. H., Barlow, B. N., Marsh, T. R., Gänsicke, B. T., Napiwotzki, R., O'Toole, S. J.;

The MUCHFUSS Project - Searching for Massive Compact Companions to Hot Subdwarf Stars, 2010, AIP Conf Ser., 1314, 67

 

Geier, S., Heber, U., Tillich, A., Hirsch, H., Müller, S., Kupfer, T., Schaffenroth, V., Classen, L., Maxted, P. F. L., Østensen, R. H., Barlow, B. N., Marsh, T. R., Gänsicke, B. T., Napiwotzki, R., O'Toole, S. J.;

Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) - Status report, 2010, AIP Conf Ser., 1273, 263

 

Classen, L., Geier, S., Heber, U., O'Toole, S. J.;  

RV survey of low-mass companions to sdB stars, 2010, AIP Conf Ser., 1273, 247

 

Schaffenroth, V., Geier, S., Heber, U., Drechsel, H., Østensen, R. H., Maxted, P. F. L., Kupfer, T., Barlow, B. N.;

Analysis of two eclipsing hot subdwarf binaries with a low mass stellar and a brown dwarf companion, 2010, AIP Conf Ser., 1273, 243

 

Tillich, A., Geier, S., Heber, U., Hirsch, H., Maxted, P.F.L., Gaensicke, B., et al.;

The HYPERMUCHFUSS campaign – An undiscovered high velocity population, 2009, JPhCS, 172a2009T

 

Geier, S., Heber, U., Edelmann, H., Kupfer, T., Napiwotzki, R., & Podsiadlowski, P.;

Hot subdwarf binaries – Masses and nature of their heavy compact companions, 2009, JPhCS, 172a2008G

 

Geier, S., Heber, U., & Napiwotzki, R.;

Metal abundances of subdwarf B stars from SPY - a pattern emerges, 2008, MmSAI, 79, 723

 

Geier, S., Karl, C., Edelmann, H., Heber, U., & Napiwotzki, R.;

Binary sdB stars with massive compact companions, 2008, MmSAI, 79, 608

 

Telting, J. H., Østensen, R. H., Geier, S., Heber, U., Glowienka, L., Nielsen, T., Frandsen, S.;

Time-Resolved High-Resolution Spectroscopy of the Bright sdBV Balloon 090100001, 2008, ASP Conf Ser., 392, 265

 

Geier, S., Heber, U., & Napiwotzki, R.;

Radial Velocity Variable sdO/Bs from SPY -- Preliminary Orbits of Three New Short Period Binaries, 2008, ASP Conf Ser., 392, 225

 

Geier, S., Karl, C., Edelmann, H., Heber, U., & Napiwotzki, R.;

Binary sdB Stars with Massive Compact Companions, 2008, ASP Conf Ser., 392, 207

 

Geier, S., Heber, U., & Napiwotzki, R.;

Metal Abundances of Subdwarf B Stars from SPY - a Pattern Emerges, 2008, ASP Conf Ser., 392, 159

 

Geier, S., Karl, C. A., Edelmann, H., Heber, U., & Napiwotzki, R.;

Spectroscopic Analysis of Subluminous B Stars in Binaries with Compact Companions, 2007, ASP Conf Ser., 372, 401

 

Geier, S., Nesslinger, S., Heber, U., Przybilla, N., Napiwotzki, R., & Kudritzki, R.-P.;

The Subdwarf B+ White Dwarf Binary KPD 1930+2752, a Supernova Type Ia Progenitor Candidate, 2007, ASP Conf Ser., 372, 393

 

Geier, S., Karl, C., Edelmann, H., Heber, U., & Napiwotzki, R.;

Spectroscopic Analysis of Subluminous B Stars in Binaries - Four Candidate Systems with Neutron Star/Black Hole Companions Discovered, 2006, Proceedings of the International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX (astro.ph.10467G)

 

Geier, S., Karl, C., Edelmann, H., Heber, U., & Napiwotzki, R.;

Spectroscopic Analyses of subluminous B stars in binaries, 2006, Proceedings of the International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos, 101 (isna.confE.101G)

 

Geier, S., Heber, U., Przybilla, N., & Kudritzki, R.-P.;

Time-Resolved Spectroscopy of KPD 1930+2752, 2006, Baltic Astronomy, 15, 243


Karl, C., Heber, U., Jeffery, S., Napiwotzki, R., & Geier, S.;

Spectroscopic Analysis of sdB Binaries from the Spy Project, 2006, Baltic Astronomy, 15, 151

 


 

Newspaper Articles


Schöllgen, G., Geier, S.;

Schwellenmacht Deutschland. Die Atompolitik der Bundesregierungen von Adenauer bis Schmidt oder die Geschichte einer Beihilfe zur Erosion des internationalen Nichtverbreitungsregimes, 31. Mai 2012, FAZ, 125, 7 (Link)


 

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Stephan Geier