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P. Chayer, W.V. Dixon (The Johns Hopkins University), L. Torres, J.M. Rivera (University of Puerto Rico)
We present an abundance analysis of the UV-bright star vZ 1128 in the Globular Cluster M 3 based on Far Ultraviolet Spectroscopic Explorer (FUSE) observations. vZ 1128 is a post-asymptotic giant branch star with an effective temperature of about 35,000 K and a gravity of log g = 4.0. The FUSE spectrum shows photospheric lines from CIII, NIII, NIV, OIII, SiIII, SiIV, PIV, PV, SIV, SV, and SVI. No photospheric lines from iron peak elements or beyond are observed. Using NLTE models, we find that the abundance of C, N, O, Si, P, and S relative to hydrogen is a factor 3 to 100 lower than the solar abundance. Adopting the cluster iron abundance ([Fe/H] = -1.57) for the star, we derive C, N, O, Si, P, and S abundances of [X/Fe] = -0.6, 0.9, 0.2, -0.4, -0.3, and 0.2, respectively. These values are consistent with those measured for red giants in M 3, except for [Si/Fe], which is low by roughly 0.7 dex.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.