The remarkable abundance pattern of the He-weak BP star HR 6000, and its implications for theories of CP stars

Details The remarkable abundance pattern of the He-weak BP star HR 6000, and its implications for theories of CP stars The remarkable abundance pattern of the He-weak BP star HR 6000, and its implications for theories of CP stars

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132..354a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 2, March 1984, p. 354-358. Research supported by the Danish Board for

Astronomy and Astrophysics

Astrophysics

24

Abundance, B Stars, Binary Stars, Main Sequence Stars, Peculiar Stars, Carbon, Helium, Iron, Line Spectra, Silicon, Stellar Evolution, Subdwarf Stars, Ubv Spectra, Xenon

Scientific paper

The remarkable abundance anomalies of the He-weak Bp star HR 6000 are discussed, based on detailed line identifications in the wavelength range 3323-5316 A present in a separate paper. A spectacular absence of Si and significant deficiencies of He and C are coupled with a large overabundance of Fe; Ti, Cr, P, and Mn are also enhanced. Ga, Hg, and Kr are not observed, while Xe is possibly seen. The work confirms some of the results of the IUE analysis by Castelli et al. (1981), but differs significantly in some respects. The anomalies in HR 6000 are compared with those in the three 'prototype' Bp stars 3 Cen A, Kappa Cnc, and Alpha Scl, and with the OB subdwarfs. The marked differences of HR 6000 from each of these types of Bp star make interpretation of the abundance anomalies difficult, both in terms of diffusion and nucleosynthesis. The star deserves a detailed model-atmosphere analysis.

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