Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...59....1c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 59, Jan. 1985, p. 1-14.
Astronomy and Astrophysics
Astronomy
21
A Stars, Abundance, Peculiar Stars, Stellar Composition, Ultraviolet Astronomy, Astronomical Photometry, Chemical Composition, Spectrum Analysis, Stellar Temperature
Scientific paper
A high resolution spectrum of the He-w star HR 6000, covering the SW and LW regions, has been analyzed. A fully line-blanketed model atmosphere with parameters T(e) = 14,000 K, log g = 4, microturbulence xi = 2 km/s has been adopted. This model is in agreement with the photometric data and yields the same abundance for the Fe II and Fe III ions. By using the synthetic spectrum method, the observed lines were compared with the computed ones. An under-abundance is found of C, Al, Si, Mg, S, Sc, Co, Ni, and Zn, and an overabundance of Be, P, Cl, Ti, Mn, Fe, Ga. B, O, Cr have nearly solar abundances. Circumstellar (or interstellar) shortward-shifted components affect the strong resonance lines of the following ions: C II(1) 1334.535 A, O I(2) 1302.074 A, Mg II(1) 2795.523 A, 2802.698 A, Si II(3) 1304.369 A, Fe II(1) 2599.395 A.
Castelli Fabio
Cornachin M.
Hack Margherita
Morossi Carlo
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