publication . Article . Preprint . 1999

The EUV spectrum of the unique bare stellar core H1504+65

Klaus Werner; Wolff, Burkhard;
  • Published: 08 Jun 1999
Abstract
We performed a spectral analysis of the EUVE spectrum and ROSAT data of the unique object H1504+65, which is an extremely hot post-AGB star entering the white dwarf cooling sequence. It is the only pre-white dwarf known, whose surface is free of hydrogen and helium, hence, it represents the bare core of a former AGB star. The EUV spectrum (75--150A) is dominated by strong OVI lines and we can identify a number of NeVII lines. EUVE and ROSAT data can be fitted with models between Teff=170000 K and 200000 K. We derive an extraordinarily high neon abundance (2%--5% by mass, i.e. 20--50 times solar) which we confirm by an optical NeVII line detected in a Keck HIRES ...
Subjects
free text keywords: Astrophysics
20 references, page 1 of 2

Barstow M.A., Holberg J.B., Koester D., Nousek J.A., Werner K. 1995, in White Dwarfs, eds. D. Koester and K. Werner, Lecture Notes in Physics 443, Springer, Berlin, p. 302

Bashkin S., Stoner J.O., Jr. 1975, Atomic Energy Levels & Grotrian Diagrams, Vol. 1, Amsterdam, North Holland

Dimitrijevic M.S., Sahal-Brechot S. 1992, A&AS 93, 359

Hubeny I., Hummer D.G., Lanz T. 1994, A&A 282, 157

Hummer D.G., Mihalas D. 1988, ApJ 331, 794

Iben I. Jr., Ritossa C., Garcia-Berro E. 1997, ApJ 489, 772

Jordan S., Wolff B., Koester D., Napiwotzki R. 1994, A&A 290, 834

Kruk J.W., Werner K. 1998, ApJ 502, 858

Nousek J.A., Shipman H.L., Holberg J.B., Liebert J., Pravdo S.H., White N.E., Giommi P. 1986, ApJ 309, 230

Rumph T., Bowyer S., Vennes S. 1994, AJ 107, 2108

Seaton M.J., Yan Y., Mihalas D., Pradhan A.K. 1994, MNRAS 266, 805

Werner K. 1991, A&A 251, 147

Werner K., Rauch T. 1994, A&A 284, L5

Werner K., Dreizler S. 1999, in Computational Astrophysics, eds. H. Riffert and K. Werner, Journal of Computational and Applied Mathematics, Elsevier, in press

Werner K., Heber U., Hunger K. 1991, A&A 244, 437

20 references, page 1 of 2
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publication . Article . Preprint . 1999

The EUV spectrum of the unique bare stellar core H1504+65

Klaus Werner; Wolff, Burkhard;