FUSE observations of PG1342+444: new insights into the nature of the hottest DA white dwarfs

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

9

Methods: Data Analysis, Stars: Abundances, Stars: Atmospheres, Stars: Individual: Pg1342+444, White Dwarfs, Ultraviolet: Stars, Methods: Data Analysis, Stars: Abundances, Stars: Atmospheres, Stars: Individual: Pg1342+444, White Dwarfs, Ultraviolet: Stars

Scientific paper

We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the very hot (Teff~60000K) DA white dwarf PG1342+444, describing our data reduction and analysis techniques. The spectrum reveals a number of photospheric absorption lines from high ionization species along with numerous interstellar features. The photospheric detections include the 1031.9- and 1037.0-Å OVI lines which are seen for the first time in a hot DA atmosphere and are usually associated with the much hotter PG1159 stars and so-called OVI central stars of planetary nebulae. Estimates of the stellar effective temperature made independently using both the Balmer and Lyman series lines are in disagreement (Teff~67000 and ~54000K respectively), when taking into account just the statistical uncertainties in the analyses. However, the presence of weak absorption from the CIII multiplet near 1176Å, which is predicted to be much stronger if the star were as cool as the Lyman measurement suggests, leads us to favour the higher temperature. PG1342+444 appears to have enhanced C, Fe and Ni abundances in its atmosphere compared with all the other G191-B2B-like DA white dwarfs, which might affect the temperature structure of the atmosphere if not homogeneously distributed, as assumed in this study.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

FUSE observations of PG1342+444: new insights into the nature of the hottest DA white dwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with FUSE observations of PG1342+444: new insights into the nature of the hottest DA white dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FUSE observations of PG1342+444: new insights into the nature of the hottest DA white dwarfs will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1108539

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.