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arXiv:astro-ph/0006235 (astro-ph)
[Submitted on 16 Jun 2000]

Title:Photospheric Metals in the FUSE Spectrum of the Subdwarf B Star PG0749+658

Authors:R. G. Ohl (Johns Hopkins U., U. of Virginia), P. Chayer (Johns Hopkins U., U. of Victoria), H. W. Moos (Johns Hopkins U.)
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Abstract: We present an abundance analysis of the far-ultraviolet (905--1187 A) spectrum of the subdwarf B star PG0749+658, obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE). The data have a resolution of about R = lambda / Delta lambda = 12000--15000 (20--25 km/s). 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 a LTE stellar atmosphere model. He, C, N, Si, and Cl are depleted by a factor of >~10 with respect to solar, 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 to predictions based on radiative levitation theory. The radial velocity of the foreground interstellar material has one dominant component, and coincides with that of the photospheric lines.
Comments: 8 pages, 2 figures; This paper will appear in the FUSE special issue of ApJ Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0006235
  (or arXiv:astro-ph/0006235v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0006235

Submission history

From: Raymond Ohl [view email]
[v1] Fri, 16 Jun 2000 20:29:02 UTC (49 KB)
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