High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey. III. DA white dwarfs

摘要

The ESO Supernova Ia Progenitor Survey (SPY) took high-resolution spectra ofmore than 1000 white dwarfs and pre-white dwarfs. About two thirds of the starsobserved are hydrogen-dominated DA white dwarfs. Here we present a catalog anddetailed spectroscopic analysis of the DA stars in the SPY. Atmosphericparameters effective temperature and surface gravity are determined for normalDAs. Double-degenerate binaries, DAs with magnetic fields or dM companions, areclassified and discussed. The spectra are compared with theoretical modelatmospheres using a chi^2 fitting technique. Our final sample contains 615 DAs,which show only hydrogen features in their spectra, although some aredouble-degenerate binaries. 187 are new detections or classifications. We alsofind 10 magnetic DAs (4 new) and 46 DA+dM pairs (10 new).