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Preprint 02/04

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

K. Werner (1), T. Rauch (1,2), M.A. Barstow (3), J.W. Kruk (4)

(1) Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D-72076 Tübingen, Germany
(2) Dr.-Remeis-Sternwarte, Universität Erlangen-Nürnberg, Sternwartstraße 7, D-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, U.S.A.

To be published in: A&A

Abstract. 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.

astro-ph/0404325

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