Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...538l..95o&link_type=abstract
The Astrophysical Journal, Volume 538, Issue 1, pp. L95-L98.
Astronomy and Astrophysics
Astronomy
12
Stars: Abundances, Stars: Horizontal-Branch, Stars: Individual: Alphanumeric: Pg 0749+658
Scientific paper
We present an abundance analysis of the far-ultraviolet (905-1187 Å) spectrum of the subdwarf B star PG 0749+658 obtained by the Far Ultraviolet Spectroscopic Explorer. The data have a resolution of about R=λ/Δλ=12000-15000 Å (20-25 km s-1). We determine C, N, Si, P, S, Cr, Mn, Fe, Co, and Ni abundances, and upper limits on the abundance of Cl and V, using a grid of synthetic spectra based on an LTE stellar atmosphere model. He, C, N, Si, and Cl are depleted by a factor of >~10 with respect to the solar abundance, while P, S, and Fe are diminished by less than a factor of 10. We measure a solar abundance of Cr, Mn, and Co and a Ni enhancement of ~0.6 dex. We compare these values with predictions based on radiative levitation theory.
Chayer Pierre
Moos Warren H.
Ohl Raymond G.
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