Analysis of IUE spectra of helium-rich white dwarf stars

Details Analysis of IUE spectra of helium-rich white dwarf stars Analysis of IUE spectra of helium-rich white dwarf stars

2006-02-07

arxiv.org/abs/astro-ph/0602169v1

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures

Scientific paper

10.1051/0004-6361:20054221

We studied the class of DB white dwarf stars, using re-calibrated UV spectra for thirty four DBs obtained with the IUE satellite. By comparing the observed energy distributions with model atmospheres, we simultaneously determine spectroscopic distances (d), effective temperature (Teff), and surface gravities (log g). Using parallax measurements and previous determinations of Teff and log g from optical spectra, we can study whether the atmospheres of eleven DB stars are consistent with pure He or have a small amount of H contamination. We also report on our observations of seventeen stars with Teff close to the DB instability strip through time series photometry and found them to be non variable within our detection limits.

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