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EUVE and ORFEUS Observations of the Cool DO White Dwarf HD 149499 B

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Astrophysics in the Extreme Ultraviolet

Abstract

We present the results of a recent spectroscopic investigation of the cool DO white dwarf HD 149499 B in the EUV and FUV ranges. Observations were performed with the spectrograph of the EUVE satellite and the Berkeley EUV/FUV spectrometer of the ORFEUS space experiment.† The analysis of the ORFEUS spectrum, performed with a grid of LTE model atmospheres, yielded the basic parameters T eff = 49500 ± 500 K and log g = 7.97 ± 0.08. This result is confirmed by the EUVE spectra. The photospheric hydrogen Lyman lines in the FUV spectrum indicate the presence of hydrogen: log nH/nHe = -0.65 ± 0.12. The implications of this finding for the spectral evolution of white dwarfs are discussed. A check of the LTE assumption was performed by a comparison with NLTE atmospheres calculated for appropriate parameters. The interstellar hydrogen column towards the HD 149499 system amounts to N H = (7±2)·1018 cm-2.

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Author information

Authors and Affiliations

  1. Dr. Remeis-Sternwarte, Sternwartstr. 7, 96049, Bamberg, Germany

    R. Napiwotzki (Dr.)

  2. Institut für Astronomie und Astrophysik der Universität, 24098, Kiel, Germany

    S. Jordan, D. Koester, T. Rauch & V. Weidemann

  3. Center for EUV Astrophysics, University of California, 2150 Kittredge Street, Berkeley, CA, 94720-5030, USA

    S. Bowyer & M. Hurwitz

Authors
  1. R. Napiwotzki
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  2. S. Jordan
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  3. S. Bowyer
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  4. M. Hurwitz
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  5. D. Koester
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  6. T. Rauch
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  7. V. Weidemann
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Editor information

Editors and Affiliations

  1. University of California, Berkeley, USA

    Stuart Bowyer (Professor in the Graduate School) (Professor in the Graduate School)

  2. Center for EUV Astrophysics, University of California, Berkeley, USA

    Roger F. Malina (Director) (Director)

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© 1996 Springer Science+Business Media Dordrecht

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Napiwotzki, R. et al. (1996). EUVE and ORFEUS Observations of the Cool DO White Dwarf HD 149499 B. In: Bowyer, S., Malina, R.F. (eds) Astrophysics in the Extreme Ultraviolet. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3988-5_39

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  • DOI: https://doi.org/10.1007/978-94-011-3988-5_39

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5764-6

  • Online ISBN: 978-94-011-3988-5

  • eBook Packages: Springer Book Archive

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