Uli Heber
University of Erlangen-Nuremberg
68 Papers
834 Citations
Uli Heber is an academic researcher from University of Erlangen-Nuremberg. The author has contributed to research in topics: Stars & Subdwarf. The author has an hindex of 22, co-authored 68 publications.
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Papers
High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey - III. DA white dwarfs
Detlev Koester,B. Voss,B. Voss,Ralf Napiwotzki,Norbert Christlieb,D. Homeier,Thorsten Lisker,Thorsten Lisker,Dieter Reimers,Uli Heber +9 more
TL;DR: In this paper, a catalog and detailed spectroscopic analysis of the DA stars in the ESO Supernova Ia Progenitor Survey (SPY) is presented, and the spectral properties of normal DAs are compared with theoretical model atmospheres using a χ 2 fitting technique.
HE 0437-5439 -- an unbound hyper-velocity main-sequence B-type star
TL;DR: A 16th magnitude star, HE0437-5439, with a heliocentric radial velocity of +723+-3km/s was discovered in this article.
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Hot subdwarfs from the ESO Supernova Ia Progenitor Survey - I. Atmospheric parameters and cool companions of sdB stars
Thorsten Lisker,Thorsten Lisker,Uli Heber,Ralf Napiwotzki,Ralf Napiwotzki,Norbert Christlieb,Zhanwen Han,D. Homeier,Dieter Reimers +8 more
TL;DR: In this paper, a high-resolution, high-quality sample of optical spectra for 76 subdwarf B (sdB) stars from the ESO Supernova Ia Progenitor Survey (SPY, Napiwotzki et al. 2001) is presented.
Spectral analysis of sdB stars from the Hamburg Quasar Survey
TL;DR: In this article, a spectral analysis of a large sample of subdwarf B stars selected from follow-up obser- vations of candidates from the Hamburg Quasar Survey is presented, where fundamental parameters (eective temperature, gravity and helium abundance) are determined by matching synthetic line profiles calculated from model atmospheres to all hydrogen and helium absorption lines present in the observed optical spectra.
Hot subdwarfs from the ESO supernova Ia progenitor survey. II. Atmospheric parameters of subdwarf O stars
A. Stroeer,A. Stroeer,Uli Heber,T. Lisker,T. Lisker,Ralf Napiwotzki,Ralf Napiwotzki,Stefan Dreizler,Norbert Christlieb,Dieter Reimers +9 more
TL;DR: In this article, the spectral properties of hot subdwarf stars were investigated by fitting the profiles of hydrogen and helium lines using dedicated synthetic spectra calculated from an extensive grid of NLTE model atmospheres.