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Subdwarf B Stars from the ESO Supernova Ia Progenitor Survey -- Observation versus Theory
(Astronomical Society of the Pacific, 2005)
We present the analysis of a high-quality sample of optical spectra for 76 sdB stars from the ESO Supernova Ia Progenitor Survey. Effective temperature, surface gravity, and photospheric helium abundance were derived from ...
New Results from the Supernova Ia Progenitor Survey
(Astronomical Society of the Pacific, 2005)
We report on a systematic radial velocity survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae: SPY (ESO Supernovae Ia Progenitor surveY). More than 1000 white dwarfs and pre-white ...
DAZ White Dwarfs in the SPY Sample
(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 ...