Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717502c&link_type=abstract
American Astronomical Society Meeting 207, #175.02; Bulletin of the American Astronomical Society, Vol. 37, p.1444
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Chayer Pierre
Dixon William V.
Rivera M. J.
Torres Legna
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