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Preprint 09c/10

Analysis of Chandra-LETG spectra of two DA white dwarfs and a PG1159 star

J. Adamczak (1), K. Werner (1), T. Rauch (1), S. Schuh (2), J. J. Drake (3) and J. W. Kruk (4)

1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics,
Eberhard Karls University, D-72076 Tübingen, Germany
2) Georg August University Göttingen, Germany
3) Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
4) NASA, Goddard Space Flight Center, USA

To be published in: Proceedings of the 17th European White Dwarf Workshop, AIP Conference Series

Abstract. We present results of model-atmosphere analyses of soft X-ray spectra of three hot WDs. These are the relatively iron-rich DA GD246, the surprisingly metal-poor DA LB1919, and the Hdeficient PG1159-type star PG1520+525. The two DAs are modeled with chemically stratified and with homogeneous NLTE models in order to constrain metal abundances. FUSE and HST spectra are also employed. For the PG1159 star the effective temperature can be constrained to a precision that is not attained with optical and UV spectroscopy alone.
 

Preprint (213 kb PDF file including figures)

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