Issue |
A&A
Volume 421, Number 3, July III 2004
|
|
---|---|---|
Page(s) | 1169 - 1183 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20047154 | |
Published online | 29 June 2004 |
Chandra and FUSE spectroscopy of the hot bare stellar core H 1504+65 *
1
Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
2
Dr.-Remeis-Sternwarte, Universität Erlangen-Nürnberg, Sternwartstraße 7, 96049 Bamberg, Germany
3
Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
4
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
Corresponding author: K. Werner, werner@astro.uni-tuebingen.de
Received:
27
January
2004
Accepted:
6
April
2004
H 1504+65 is an extremely hot hydrogen-deficient white dwarf with an effective temperature close to 200 000 K. We present new FUV and soft X-ray spectra obtained with FUSE and Chandra, which confirm that H 1504+65 has an atmosphere primarily composed of carbon and oxygen. The Chandra LETG spectrum (60–160 Å) shows a wealth of photospheric absorption lines from highly ionized oxygen, neon, and – for the first time identified in this star – magnesium and suggests relatively high Ne and Mg abundances. This corroborates an earlier suggestion that H 1504+65 represents a naked C/O stellar core or even the C/O envelope of an O-Ne-Mg white dwarf.
Key words: stars: abundances / stars: atmospheres / stars: evolution / stars: AGB and post-AGB / stars: white dwarfs / stars: individual: H 1504+65
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.