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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 09m/10

(F)UV Spectral Analysis of Hot, Hydrogen-Rich Central Stars of Planetary Nebulae

M. Ziegler (1), T. Rauch (1), K. Werner (1) and J. W. Kruk (2)

1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics,
Eberhard Karls University, Sand 1, D-72076 Tübingen, Germany
2) NASA Goddard Space Flight Center, Greenbelt, MD20771, USA

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

Abstract. Metal abundances of CSPNe are not well known although they provide important constraints on AGB nucleosynthesis.We aim to determine metal abundances of two hot, hydrogen-rich CSPNe (namely of A35 and NGC3587, the latter also known as M97 or the Owl Nebula) and to derive Teff and logg precisely from high-resolution, high-S/N (far-) ultraviolet observations obtained with FUSE and HST/STIS. For this purpose, we utilize NLTE model atmospheres calculated with TMAP, the TübingenModel Atmosphere Package. Due to strong line absorption of the ISM, simultaneous modeling of interstellar features has become a standard tool in our analyses. We present preliminary results, demonstrating the importance of combining stellar and interstellar models, in order to clearly identify and measure the strengths of strategic photospheric lines.

Preprint (70 kb PDF file including figures)

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