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The Mass of the sdB Primary of the Binary HS 2333+3927
(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 ...
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 ...
Subluminous O Stars from the ESO Supernova Progenitor Survey - Observation versus Theory
(Astronomical Society of the Pacific, 2005)
The ESO Supernova Progenitor Survey (SPY) has identified 58 (mostly helium-rich) subluminous O stars. We use the Balmer line strength to distinguish sdO from He-sdO (no Balmer lines) and present the results of the analyses ...
Subdwarf B Binaries from the SPY Project
(Astronomical Society of the Pacific, 2005)
In the course of our search for double degenerate binaries as potential progenitors of type Ia supernovae with the ESO VLT (ESO - SN Ia progenitor survey - SPY), several sdB binaries were discovered. We report on the ...
Time-resolved Observations of the Short Period CV SDSS J123813.73-033933.0
(Astronomical Society of the Pacific, 2005)
We present simultaneous spectral and photometric observations of SDSS J123813.73-033933.0. From H® radial velocity measurements we determined the orbital period of the system to be 0:05592 + or - 0:00002 days (80.53 min). ...
A Model of the Local WD Population
(Astronomical Society of the Pacific, 2005)
We present a model of the solar neighbourhood (d<100 pc) white dwarf (WD) population and show its distribution in e®ective temperature and mass. The WDs are created by the death-rate of a population model matching the local ...
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 ...