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Browsing by Author "Voss, B."
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Binaries discovered by the SPY project IV. Five single-lined DA double white dwarfs
Nelemans, G.; Napiwotzki, R.; Karl, C.; Marsh, T.R.; Voss, B.; Roelofs, G.; Izzard, R.G.; Montgomery, M.; Reerink, T.; Christlieb, N.; Reimers, D. (2005)We present results from our ongoing follow-up observations of double white dwarf binaries detected in the ESO SN Ia Progenitor SurveY (SPY). We discuss our observing strategy and data analysis and present the orbital ... -
DAZ White Dwarfs in the SPY Sample
Koester, D.; Rollenhagen, K.; Napiwotzki, R.; Voss, B.; Christlieb, N.; Homeier, D.; Reimers, D. (Astronomical Society of the Pacific, 2005)We search for faint Ca II lines in the spectra of about 800 apparently single white dwarfs observed at high resolution for the SPY (ESO Supernova Progenitor Survey) survey. Photospheric Ca is detected in 24 DAZ; in 25 ... -
Discovery of eleven new ZZ Ceti stars
Castanheira, B.G.; Kepler, S.O.; Mullally, F.; Winget, D.E.; Koester, D.; Voss, B.; Kleinman, S.J.; Nitta, A.; Eisenstein, D.J.; Napiwotzki, R.; Reimers, D. (2006) -
Discovery of seven ZZ Ceti stars using a new photometric selection method
Voss, B.; Koester, D.; Ostensen, R.; Kepler, S.O.; Napiwotzki, R.; Homeier, D.; Reimers, D. (2006) -
High resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey III. DA white dwarfs
Koester, D.; Voss, B.; Napiwotzki, R.; Christlieb, N.; Homeier, D.; Lisker, T.; Reimers, D.; Heber, U. (2009-10)Context. The ESO Supernova Ia Progenitor Survey (SPY) took high-resolution spectra of more than 1000 white dwarfs and pre-white dwarfs. About two thirds of the stars observed are hydrogen-dominated DA white dwarfs. Here ... -
HS 0146 1847 - a DAZB white dwarf of very unusual composition
Koester, D.; Napiwotzki, R.; Voss, B.; Homeier, D.; Reimers, D. (2005-08) -
HS 2333 + 3927: a new sdB binary with a large reflection effect
Karl, C.; Heber, U.; Drechsel, H.; Napiwotzki, R.; Altmann, M.; Ostensen, R.; Folkes, S.; Solheim, J.E.; Cordes, O.; Voss, B.; Koester, D. (2004)We report the discovery of a binary, HS 2233 + 3927, consisting of an sdB star with a faint companion. From its lightcurve the orbital period of 14,844 s, the mass ratio, the inclination, and other system parameters are ... -
HS 2333 3927: A new sdB dM binary with a large reflection effect
Heber, U.; Drechsel, H.; Ostensen, R.; Karl, C.; Napiwotzki, R.; Altmann, M.; Cordes, O.; Solheim, J.E.; Voss, B.; Koester, D.; Folkes, S. (2004-06) -
The Mass of the sdB Primary of the Binary HS 2333+3927
Heber, U.; Drechsel, H.; Karl, C.; Ostensen, R.; Folkes, S.; Napiwotzki, R.; Altmann, M.; Cordes, O.; Solheim, J.E.; Voss, B.; Koester, D. (Astronomical Society of the Pacific, 2005)Short period sdB binaries with cool companions are crucial to understand pre-CV evolution, because they will evolve into cataclysmic variables, when the sdB will have left the extended horizontal branch. Recently we ... -
Metal traces in white dwarfs of the SPY (ESO Supernova Ia Progenitor Survey) sample
Koester, D.; Rollenhagen, K.; Napiwotzki, R.; Voss, B.; Christlieb, N.; Homeier, D.; Reimers, D. (2005-03) -
Six New ZZ Ceti Stars from the SPY and the HQS Surveys
Voss, B.; Koester, D.; Ostensen, R.; Napiwotzki, R.; Homeier, D.; Reimers, D. (Astronomical Society of the Pacific, 2007)We report on the discovery of six new ZZCeti stars. They were selected as candidates based on preparatory photometric observations of ob- jects from the Hamburg Quasar Survey (HQS), and based on the spectra of the Supernova ... -
Two new ZZ Ceti pulsators from the HS and HE surveys
Silvotti, R.; Voss, B.; Bruni, I.; Koester, D.; Reimers, D.; Napiwotzki, R.; Homeier, D. (2005)