Chandra and FUSE spectroscopy of the hot bare stellar core H1504+65

Details Chandra and FUSE spectroscopy of the hot bare stellar core H1504+65 Chandra and FUSE spectroscopy of the hot bare stellar core H1504+65

2004-04-16

arxiv.org/abs/astro-ph/0404325v1

Astron.Astrophys. 421 (2004) 1169-1183

Astronomy and Astrophysics

Astrophysics

15 pages, 10 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20047154

H1504+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 H1504+65 has an atmosphere primarily composed of carbon and oxygen. The Chandra LETG spectrum (60-160 Angstroem) 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 H1504+65 represents a naked C/O stellar core or even the C/O envelope of an O-Ne-Mg white dwarf.

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