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Chandra and FUSE spectroscopy of the hot bare stellar core H 1504+65
journal contribution
posted on 2012-10-24, 09:16 authored by K. Werner, T. Rauch, M. A. Barstow, J. W. KrukH 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.
History
Citation
Astronomy & Astrophysics, 2004, 421 (3), pp. 1169-1183Version
- VoR (Version of Record)