COS and FUSE Observations of the Post-AGB Star Barnard 29 in M13

Details COS and FUSE Observations of the Post-AGB Star Barnard 29 in M13 COS and FUSE Observations of the Post-AGB Star Barnard 29 in M13

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733815d&link_type=abstract

American Astronomical Society, AAS Meeting #217, #338.15; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of the far-ultraviolet spectrum of the post-AGB star Barnard 29 in the globular cluster M13 (NGC 6205) obtained with COS and FUSE. The data extend from the Lyman limit to about 1780 A with a spectral resolution R 20,000. Previous observers have derived the star's effective temperature (Teff = 20,000 K), surface gravity (log g = 3.0), and abundances of He, C, N, O, Mg, Si, Al, S, and Fe. In addition to these species, we detect absorption from the light elements P and Cl, the iron-peak elements Ti, Cr, and Ni, and the heavy elements Ge and Zr. Using LTE and NLTE stellar atmosphere models, we derive the abundances of these elements and set upper limits for several more. Our Ge and Zr abundances will provide useful constraints on models of nucleosynthesis in AGB stars.
This work is supported by NASA grant NNX08AC14G.

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