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Preprint 09g/10

(F)UV Spectroscopy of K648: Abundance Determination of Trace Elements

S. J. Mohamad-Yob (1), M. Ziegler (2), T. Rauch (2) and K. Werner (2)

1) School of Applied Physics, Faculty of Science and Technology,
Universiti Kebangsaan Malaysia, Bangi, Malaysia
2) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics,
Eberhard Karls University, Sand 1, D-72076 Tübingen, Germany

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

Abstract. We present preliminary results of an ongoing spectral analysis of K648, the central star of the planetary nebula Ps 1, based on high resolution FUV spectra. K648, in M15 is one of only four known PNe in globular clusters. The formation of this post-AGB object in a globular cluster is still unclear. Our aim is to determine Teff, log g, and the abundances of trace elements, in order to improve our understanding of post-AGB evolution of extremely metal-poor stars, especially PN formation in globular clusters. We analyzed FUSE, HST/STIS, and HST/FOS observations. A grid of stellar model atmospheres was calculated using the Tübingen NLTEModel Atmosphere Package (TMAP).

Preprint (42 kb PDF file including figures)

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