Issue |
A&A
Volume 450, Number 1, April IV 2006
|
|
---|---|---|
Page(s) | 331 - 337 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20054221 | |
Published online | 03 April 2006 |
Analysis of IUE spectra of helium-rich white dwarf stars
1
Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-900 Porto-Alegre, RS, Brazil e-mail: barbara@if.ufrgs.br
2
Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, 1180, Wien, Austria
3
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
4
Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany
Received:
17
September
2005
Accepted:
30
December
2005
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 (), and surface gravities (
).
Using parallax measurements and previous determinations of
and
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
close to the DB
instability strip through time series photometry and found them to be non
variable within our detection limits.
Key words: stars: white dwarfs / stars: variables: general / stars: oscillations / ultraviolet: stars
© ESO, 2006
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