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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 ...
Binaries discovered by the SPY project IV. Five single-lined DA double white dwarfs
(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
(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 ...
A study of two post-common envelope binary systems
(2005)
We present intermediate-resolution, phase-resolved spectra of the close-binary systems EC 11575−1845 and V664 Cas, the central star of the planetary nebula HFG 1. Both systems have a very rich emission-line spectrum ...