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H 1504+65 – The Naked Stellar C/O Core of a Former Red Giant Observed with FUSE and Chandra

Published online by Cambridge University Press:  12 April 2016

Klaus Werner ,
Thomas Rauch ,
Martin A. Barstow  and
Jeff W. Kruk
Klaus Werner
Affiliation:
Institut für Astronomie und Astrophysik, Univ. Tübingen, Sand 1, D-72076 Tübingen, Germany
Thomas Rauch
Affiliation:
Institut für Astronomie und Astrophysik, Univ. Tübingen, Sand 1, D-72076 Tübingen, Germany
Martin A. Barstow
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Jeff W. Kruk
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore MD 21218, USA

Abstract

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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 H1504+65 has an atmosphere primarily composed of carbon and oxygen. The Chandra spectra show a wealth of absorption lines from highly ionized oxygen, neon and magnesium and suggest 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.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 187: Exotic Stars as Challenges to Evolution , 2002 , pp. 201 - 207
Copyright
Copyright © Astronomical Society of the Pacific 2002

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