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Non-LTE model atmosphere analysis of the supersoft X-ray source RX J0122.9-7521

  • Part III X-ray and Optical Observations of SSS
  • Conference paper
  • First Online:
Supersoft X-Ray Sources

Part of the book series: Lecture Notes in Physics ((LNP,volume 472))

Abstract

The supersoft X-ray source RX J0122.9-7521 was discovered in the ROSAT all-sky survey and suspected to be a member of the Small Magellanic Cloud (Kahabka et al. 1994). More recently the source has been optically identified with an extremely hot PG 1159 star (Cowley et al. 1995).

Here we present a NLTE model atmosphere analysis of a pointed ROSAT observation combined with medium resolution optical spectroscopy. RX J0122.9-7521 appears to be the hottest known PG 1159 star. It is compact and relatively massive (T eff=180 000 K, log g=7.5, M=0.7 M⊙). In contrast to other stars of this group, the carbon and oxygen abundances in the helium-dominated atmosphere of RX J0122.9-7521 are unusually low. Our results allow a distance determination which clearly rules out SMC membership of RX J0122.9-7521.

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Author information

Authors and Affiliations

  1. Lehrstuhl Astrophysik, Universität Potsdam, Germany

    K. Werner

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

    B. Wolff

  3. Observatoire Astronomique, Strasbourg, France

    M. W. Pakull

  4. Department of Physics and Astronomy, Arizona State University, Tempe, USA

    A. P. Cowley & P. C. Schmidtke

  5. Dominion Astrophysical Observatory, Victoria, B.C., Canada

    J. B. Hutchings & D. Crampton

Authors
  1. K. Werner
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  2. B. Wolff
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  3. M. W. Pakull
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  4. A. P. Cowley
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  5. P. C. Schmidtke
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  6. J. B. Hutchings
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  7. D. Crampton
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Editor information

Jochen Greiner

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© 1996 Springer-Verlag

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Werner, K. et al. (1996). Non-LTE model atmosphere analysis of the supersoft X-ray source RX J0122.9-7521. In: Greiner, J. (eds) Supersoft X-Ray Sources. Lecture Notes in Physics, vol 472. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0102256

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  • DOI: https://doi.org/10.1007/BFb0102256

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-61390-9

  • Online ISBN: 978-3-540-68512-8

  • eBook Packages: Springer Book Archive

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