Publications by the Stellar Group

2018

• Irrgang, A.; Kreuzer, S.; Heber, U.:
  Hypervelocity stars in the Gaia era. Runaway B stars beyond the velocity limit of classical ejection mechanisms
  In Astronomy and Astrophysics 620 (2018)
• Schindewolf, M.; Németh, P.; Heber, U.; and 4 coauthors:
  A quantitative NLTE analysis of visual and ultraviolet spectra of four helium-rich subdwarf O stars
  In Astronomy and Astrophysics 620 (2018)
• Schneider, D.; Irrgang, A.; Heber, U.; and 2 coauthors:
  NLTE spectroscopic analysis of the ³He anomaly in subluminous B-type stars
  In Astronomy and Astrophysics 618 (2018)
• Irrgang, A.; Kreuzer, S.; Heber, U.; and 1 coauthor:
  A quantitative spectral analysis of 14 hypervelocity stars from the MMT survey
  In Astronomy and Astrophysics 615 (2018)
• Kreuzer, Simon; Irrgang, Andreas; Heber, Ulrich:
  Spectroscopy of hot subdwarf binaries
  In Open Astronomy 27 (2018)
• Schaffenroth, V.; Geier, S.; Heber, U.; and 4 coauthors:
  The MUCHFUSS photometric campaign
  In Astronomy and Astrophysics 614 (2018)
• Wolz, Maximilian; Kupfer, Thomas; Drechsel, Horst; and 7 coauthors:
  Spectroscopic and Photometric Analysis of the HW Vir Star PTF1 J011339.09+225739.1
  In Open Astronomy 27 (2018)
• Heber, Ulrich; Irrgang, Andreas; Schaffenroth, Johannes:
  Spectral energy distributions and colours of hot subluminous stars
  In Open Astronomy 27 (2018)
• Schindewolf, Markus; Németh, Peter; Heber, Ulrich; and 3 coauthors:
  Chemical fingerprints of He-sdO stars
  In Open Astronomy 27 (2018)
• Dorsch, Matti; Latour, Marilyn; Heber, Ulrich:
  Spectral analysis of the He-enriched sdO-star HD 127493
  In Open Astronomy 27 (2018)
• Tsvetkova, K.; Tsvetkov, M.; Kirov, N.; and 3 coauthors:
  On some Bamberg wide-field plate catalogues recently incorporated into WFPDB
  In Astronomical and Astrophysical Transactions 30 (2018)

2017

• Geier, Stephan; Østensen, Roy H.; Nemeth, Peter; and 6 coauthors:
  Meet the family – the catalog of known hot subdwarf stars
  In Open Astronomy 26 (2017)
• Schneider, David; Irrgang, Andreas; Heber, Ulrich; and 2 coauthors:
  On the ³He anomaly in hot subdwarf B stars
  In Open Astronomy 26 (2017)
• Kupfer, T.; Ramsay, G.; van Roestel, J.; and 20 coauthors:
  The OmegaWhite Survey for Short-period Variable Stars. V. Discovery of an Ultracompact Hot Subdwarf Binary with a Compact Companion in a 44-minute Orbit
  In The Astrophysical Journal 851 (2017)
• Kupfer, T.; Przybilla, N.; Heber, U.; and 3 coauthors:
  Quantitative spectroscopy of extreme helium stars Model atmospheres and a non-LTE abundance analysis of BD+10°2179
  In Monthly Notices of the Royal Astronomical Society 471 (2017)
• Geier, S.; Kupfer, T.; Heber, U.; and 13 coauthors:
  The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project (Corrigendum)
  In Astronomy and Astrophysics 602 (2017)
• Ziegerer, E.; Heber, U.; Geier, S.; and 4 coauthors:
  Spectroscopic twin to the hypervelocity sdO star US 708 and three fast sdB stars from the Hyper-MUCHFUSS project
  In Astronomy and Astrophysics 601 (2017)
• Kupfer, Thomas; van Roestel, Jan; Brooks, Jared; and 19 coauthors:
  PTF1 J082340.04+081936.5: A Hot Subdwarf B Star with a Low-mass White Dwarf Companion in an 87-minute Orbit
  In The Astrophysical Journal 835 (2017)

2016

• Heber, U.:
  Hot Subluminous Stars
  In Publications of the Astronomical Society of the Pacific 128 (2016)
• Kaplan, David L.; Kupfer, Thomas; Nice, David J.; and 32 coauthors:
  PSR J1024-0719: A Millisecond Pulsar in an Unusual Long-period Orbit
  In The Astrophysical Journal 826 (2016)
• Németh, Péter; Ziegerer, Eva; Irrgang, Andreas; and 4 coauthors:
  An Extremely Fast Halo Hot Subdwarf Star in a Wide Binary System
  In The Astrophysical Journal 821 (2016)
• Reindl, N.; Geier, S.; Kupfer, T.; and 5 coauthors:
  Radial velocity variable, hot post-AGB stars from the MUCHFUSS project. Classification, atmospheric parameters, formation scenarios
  In Astronomy and Astrophysics 587 (2016)
• Latour, M.; Heber, U.; Irrgang, A.; and 7 coauthors:
  Quantitative spectral analysis of the sdB star HD 188112: A helium-core white dwarf progenitor
  In Astronomy and Astrophysics 585 (2016)

2015

• Schindewolf, M.; Levitan, D.; Heber, U.; and 4 coauthors:
  A new HW Vir binary from the Palomar Transient Factory. PTF1 J072455.75+125300.3: An eclipsing subdwarf B binary with a M-star companion
  In Astronomy and Astrophysics 580 (2015)
• Geier, S.; Kupfer, T.; Heber, U.; and 13 coauthors:
  The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project
  In Astronomy and Astrophysics 577 (2015)
• Ziegerer, E.; Volkert, M.; Heber, U.; and 3 coauthors:
  Candidate hypervelocity stars of spectral type G and K revisited
  In Astronomy and Astrophysics 576 (2015)
• Kupfer, T.; Geier, S.; Heber, U.; and 6 coauthors:
  Hot subdwarf binaries from the MUCHFUSS project. Analysis of 12 new systems and a study of the short-period binary population
  In Astronomy and Astrophysics 576 (2015)
• Geier, S.; Fürst, F.; Ziegerer, E.; and 17 coauthors:
  The fastest unbound star in our Galaxy ejected by a thermonuclear supernova
  In Science 347 (2015)
• Scholz, R. -D.; Heber, U.; Heuser, C.; and 3 coauthors:
  An ancient F-type subdwarf from the halo crossing the Galactic plane
  In Astronomy and Astrophysics 574 (2015)

2014

• Telting, J. H.; Baran, A. S.; Nemeth, P.; and 6 coauthors:
  KIC 7668647: a 14 day beaming sdB+WD binary with a pulsating subdwarf
  In Astronomy and Astrophysics 570 (2014)
• Schaffenroth, V.; Classen, L.; Nagel, K.; and 4 coauthors:
  Two candidate brown dwarf companions around core helium-burning stars
  In Astronomy and Astrophysics 570 (2014)
• Mereghetti, S.; La Palombara, N.; Esposito, P.; and 5 coauthors:
  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
  In Monthly Notices of the Royal Astronomical Society 441 (2014)
• Irrgang, A.; Przybilla, N.; Heber, U.; and 4 coauthors:
  A new method for an objective, χ²-based spectroscopic analysis of early-type stars. First results from its application to single and binary B- and late O-type stars
  In Astronomy and Astrophysics 565 (2014)
• Schaffenroth, V.; Geier, S.; Heber, U.; and 5 coauthors:
  Binaries discovered by the MUCHFUSS project. SDSS J162256.66+473051.1: An eclipsing subdwarf B binary with a brown dwarf companion
  In Astronomy and Astrophysics 564 (2014)
• Verbeek, Kars; Groot, Paul J.; Scaringi, Simone; and 13 coauthors:
  Ultraviolet-excess sources with a red/infrared counterpart: low-mass companions, debris discs and QSO selection
  In Monthly Notices of the Royal Astronomical Society 438 (2014)
• Geier, S.; Østensen, R. H.; Heber, U.; and 9 coauthors:
  Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions
  In Astronomy and Astrophysics 562 (2014)
• Maxted, P. F. L.; Bloemen, S.; Heber, U.; and 21 coauthors:
  EL CVn-type binaries – discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems
  In Monthly Notices of the Royal Astronomical Society 437 (2014)

2013

• Vos, J.; Østensen, R. H.; Németh, P.; and 3 coauthors:
  The orbits of subdwarf-B + main-sequence binaries. II. Three eccentric systems; BD +29°3070, BD +34°1543 and Feige 87
  In Astronomy and Astrophysics 559 (2013)
• Østensen, R. H.; Geier, S.; Schaffenroth, V.; and 16 coauthors:
  Binaries discovered by the MUCHFUSS project. FBS 0117+396: An sdB+dM binary with a pulsating primary
  In Astronomy and Astrophysics 559 (2013)
• Verbeek, Kars; Groot, Paul J.; Nelemans, Gijs; and 14 coauthors:
  A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey
  In Monthly Notices of the Royal Astronomical Society 434 (2013)
• Geier, S.; Heber, U.; Edelmann, H.; and 5 coauthors:
  Hot subdwarf stars in close-up view. IV. Helium abundances and the ³He isotopic anomaly of subdwarf B stars
  In Astronomy and Astrophysics 557 (2013)
• Maxted, Pierre F. L.; Serenelli, Aldo M.; Miglio, Andrea; and 8 coauthors:
  Multi-periodic pulsations of a stripped red-giant star in an eclipsing binary system
  In Nature 498 (2013)
• Geier, S.; Marsh, T. R.; Wang, B.; and 17 coauthors:
  A progenitor binary and an ejected mass donor remnant of faint type Ia supernovae
  In Astronomy and Astrophysics 554 (2013)
• Schaffenroth, V.; Geier, S.; Drechsel, H.; and 5 coauthors:
  A new bright eclipsing hot subdwarf binary from the ASAS and SuperWASP surveys
  In Astronomy and Astrophysics 553 (2013)
• Geier, S.; Heber, U.; Heuser, C.; and 3 coauthors:
  The subdwarf B star SB 290 – A fast rotator on the extreme horizontal branch
  In Astronomy and Astrophysics 551 (2013)
• Drilling, J. S.; Jeffery, C. S.; Heber, U.; and 2 coauthors:
  An MK-like system of spectral classification for hot subdwarfs
  In Astronomy and Astrophysics 551 (2013)
• Hudec, René; Kopel, Fabian; Macsics, Robert; and 3 coauthors:
  Classification of Variable Objects for Search for GRB Candidates on Bamberg Photographic Plates
  In Acta Polytechnica 53 (2013)

2012

• Vos, J.; Østensen, R. H.; Degroote, P.; and 18 coauthors:
  The orbits of subdwarf B + main-sequence binaries. I. The sdB+G0 system PG 1104+243
  In Astronomy and Astrophysics 548 (2012)
• Verbeek, Kars; Groot, Paul J.; Scaringi, Simone; and 17 coauthors:
  Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey
  In Monthly Notices of the Royal Astronomical Society 426 (2012)
• Girven, J.; Steeghs, D.; Heber, U.; and 6 coauthors:
  The unseen population of F- to K-type companions to hot subdwarf stars
  In Monthly Notices of the Royal Astronomical Society 425 (2012)
• Silvotti, R.; Østensen, R. H.; Bloemen, S.; and 17 coauthors:
  Orbital properties of an unusually low-mass sdB star in a close binary system with a white dwarf
  In Monthly Notices of the Royal Astronomical Society 424 (2012)
• Telting, J. H.; Østensen, R. H.; Baran, A. S.; and 16 coauthors:
  Three ways to solve the orbit of KIC 11 558 725: a 10-day beaming sdB+WD binary with a pulsating subdwarf
  In Astronomy and Astrophysics 544 (2012)
• Østensen, R. H.; Degroote, P.; Telting, J. H.; and 6 coauthors:
  KIC 1718290: A Helium-rich V1093-Her-like Pulsator on the Blue Horizontal Branch
  In The Astrophysical Journal 753 (2012)
• Geier, S.; Heber, U.:
  Hot subdwarf stars in close-up view. II. Rotational properties of single and wide binary subdwarf B stars
  In Astronomy and Astrophysics 543 (2012)
• Geier, S.; Schaffenroth, V.; Hirsch, H.; and 15 coauthors:
  MUCHFUSS – Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS
  In Astronomische Nachrichten 333 (2012)
• Sebastian, D.; Guenther, E. W.; Schaffenroth, V.; and 5 coauthors:
  Multi-object spectroscopy of stars in the CoRoT fields. I. Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02
  In Astronomy and Astrophysics 541 (2012)
• Deca, J.; Marsh, T. R.; Østensen, R. H.; and 7 coauthors:
  PG 1018-047: the longest period subdwarf B binary
  In Monthly Notices of the Royal Astronomical Society 421 (2012)
• Hudec, R.; Kopel, F.; Krapp, P.; and 2 coauthors:
  The Optical Transient Search in the Bamberg Southern Sky Survey: Preliminary Results
  In Acta Polytechnica 52 (2012)

2011

• Maxted, P. F. L.; Anderson, D. R.; Burleigh, M. R.; and 11 coauthors:
  Discovery of a stripped red giant core in a bright eclipsing binary system
  In Monthly Notices of the Royal Astronomical Society 418 (2011)
• Copperwheat, C. M.; Morales-Rueda, L.; Marsh, T. R.; and 2 coauthors:
  Radial-velocity measurements of subdwarf B stars
  In Monthly Notices of the Royal Astronomical Society 415 (2011)
• Østensen, R. H.; Silvotti, R.; Charpinet, S.; and 29 coauthors:
  First Kepler results on compact pulsators – VI. Targets in the final half of the survey phase
  In Monthly Notices of the Royal Astronomical Society 414 (2011)
• Balona, L. A.; Pigulski, A.; De Cat, P.; and 33 coauthors:
  Kepler observations of the variability in B-type stars
  In Monthly Notices of the Royal Astronomical Society 413 (2011)
• Geier, S.; Hirsch, H.; Tillich, A.; and 9 coauthors:
  The MUCHFUSS project – searching for hot subdwarf binaries with massive unseen companions. Survey, target selection and atmospheric parameters
  In Astronomy and Astrophysics 530 (2011)
• Geier, S.; Classen, L.; Heber, U.:
  The Fast-rotating, Low-gravity Subdwarf B Star EC 22081-1916: Remnant of a Common Envelope Merger Event
  In The Astrophysical Journal 733 (2011)
• Geier, S.; Schaffenroth, V.; Drechsel, H.; and 11 coauthors:
  Binaries Discovered by the MUCHFUSS Project: SDSS J08205+0008—An Eclipsing Subdwarf B Binary with a Brown Dwarf Companion
  In The Astrophysical Journal 731 (2011)
• Geier, S.; Napiwotzki, R.; Heber, U.; and 1 coauthor:
  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?
  In Astronomy and Astrophysics 528 (2011)
• Tillich, A.; Heber, U.; Geier, S.; and 7 coauthors:
  The Hyper-MUCHFUSS project: probing the Galactic halo with sdB stars
  In Astronomy and Astrophysics 527 (2011)
• Geier, S.; Maxted, P. F. L.; Napiwotzki, R.; and 12 coauthors:
  Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS). Analysis of seven close subdwarf B binaries
  In Astronomy and Astrophysics 526 (2011)
• Bloemen, S.; Marsh, T. R.; Østensen, R. H.; and 24 coauthors:
  Kepler observations of the beaming binary KPD 1946+4340
  In Monthly Notices of the Royal Astronomical Society 410 (2011)

2010

• Østensen, R. H.; Silvotti, R.; Charpinet, S.; and 25 coauthors:
  First Kepler results on compact pulsators – I. Survey target selection and the first pulsators
  In Monthly Notices of the Royal Astronomical Society 409 (2010)
• Oreiro, R.; Telting, J. H.; Østensen, R. H.; and 4 coauthors:
  Synthetic pulsational line profile variations
  In Astrophysics and Space Science 329 (2010)
• Baran, Andrzej; Telting, John; Østensen, Roy; and 9 coauthors:
  Constraining the degree of the dominant mode in QQ Vir
  In Astrophysics and Space Science 329 (2010)
• Østensen, R. H.; Telting, J. H.; Oreiro, R.; and 3 coauthors:
  Time-resolved spectroscopy of the sdBV V338 Serpentis
  In Astrophysics and Space Science 329 (2010)
• Telting, J.; Østensen, R.; Oreiro, R.; and 4 coauthors:
  Time-resolved high-resolution spectroscopy of the pulsating sdB star QQ Vir (PG1325+101)
  In Astrophysics and Space Science 329 (2010)
• Geier, S.; Heber, U.; Edelmann, H.; and 2 coauthors:
  Metal abundances of subdwarf B stars—the extended sample
  In Astrophysics and Space Science 329 (2010)
• Müller, S.; Geier, S.; Heber, U.:
  The cool companion of AA Doradus—Brown dwarf or late M star?
  In Astrophysics and Space Science 329 (2010)
• Geier, S.; Heber, U.; Tillich, A.; and 15 coauthors:
  Hot subdwarfs in binary systems and the nature of their unseen companions
  In Astrophysics and Space Science 329 (2010)
• Tillich, A.; Geier, S.; Heber, U.; and 7 coauthors:
  The HYPER-MUCHFUSS project—the constant high-velocity population
  In Astrophysics and Space Science 329 (2010)
• Tillich, A.; Geier, S.; Heber, U.; and 7 coauthors:
  The HYPER-MUCHFUSS project—target selection and analysis
  In Astrophysics and Space Science 329 (2010)
• Geier, S.; Heber, U.; Podsiadlowski, Ph.; and 4 coauthors:
  Hot subdwarf stars in close-up view. I. Rotational properties of subdwarf B stars in close binary systems and nature of their unseen companions
  In Astronomy and Astrophysics 519 (2010)
• Przybilla, Norbert; Tillich, Alfred; Heber, Ulrich; and 1 coauthor:
  Weighing the Galactic Dark Matter Halo: A Lower Mass Limit From the Fastest Halo Star Known
  In The Astrophysical Journal 718 (2010)
• Tillich, A.; Przybilla, N.; Scholz, R. -D.; and 1 coauthor:
  A halo blue straggler on a highly eccentric retrograde orbit
  In Astronomy and Astrophysics 517 (2010)
• Geier, S.; Heber, U.; Kupfer, T.; and 1 coauthor:
  Binaries discovered by the SPY project . V. GD 687 – a massive double degenerate binary progenitor that will merge within a Hubble time
  In Astronomy and Astrophysics 515 (2010)
• Østensen, R. H.; Oreiro, R.; Solheim, J. -E.; and 7 coauthors:
  A survey for pulsating subdwarf B stars with the Nordic Optical Telescope
  In Astronomy and Astrophysics 513 (2010)
• Irrgang, Andreas; Przybilla, Norbert; Heber, Ulrich; and 2 coauthors:
  The Nature of the Hyper-Runaway Candidate Hip 60350
  In The Astrophysical Journal 711 (2010)