High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey. III. DA white dwarfs
Abstract
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 we present a catalog and detailed spectroscopic analysis of the DA stars in the SPY.
Aims: Atmospheric parameters effective temperature and surface gravity are determined for normal DAs. Double-degenerate binaries, DAs with magnetic fields or dM companions, are classified and discussed.
Methods: The spectra are compared with theoretical model atmospheres using a χ2 fitting technique.
Results: Our final sample contains 615 DAs, which show only hydrogen features in their spectra, although some are double-degenerate binaries. 187 are new detections or classifications. We also find 10 magnetic DAs (4 new) and 46 DA+dM pairs (10 new).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 2009
- DOI:
- 10.1051/0004-6361/200912531
- arXiv:
- arXiv:0908.2322
- Bibcode:
- 2009A&A...505..441K
- Keywords:
-
- stars: white dwarfs;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- accepted by Astronomy and Astrophysics