Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..655k&link_type=abstract
Astronomy and Astrophysics, v.353, p.655-665 (2000)
Astronomy and Astrophysics
Astrophysics
41
Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Evolution, Galaxies: Magellanic Clouds
Scientific paper
In recent years, B stars have been established as reliable tracers of present day abundance patterns. They yield an independent set of abundances from He to Fe which can be cross-checked against other sources such as H ii regions and cool supergiants. In this paper, we present purely spectroscopic analyses of 9 non-supergiant B stars (13 < m_V < 15), 5 of which located in the young populous clusters NGC 1818, 2004 (LMC) and NGC 330 (SMC), the other 4 being MC field stars. CASPEC spectra (4000 Ä < lambda < 5000 Ä) with R ~ 20 000 and S/N ~ 100 are used to determine T_eff, log g, xi and the abundances of oxygen and silicon simultaneously. Particular attention is paid to a consistent treatment of the metallicity of the underlying atmosphere. Kurucz ATLAS 9 LTE atmospheres and DETAIL/SURFACE non-LTE line formation (H, He, C, N, O, Mg, Al, Si and Fe) are used throughout the analysis. While we find little difference between the abundances from cluster members and field stars, the behaviour of N is surprising: it is generally enriched with respect to the H ii value by 0.6 to 1.0 dex. In the case of NGC 1818/D1 (the only spectroscopic main sequence star in our sample), this enrichment is coupled with a depletion of C and an enrichment of He, strongly suggesting that these abundances have already been altered through some kind of mixing with CNO-processed material. Based on observations carried out at the European Southern Observatory, La Silla, Chile.
Becker Stephen R.
Gummersbach Ch. A.
Korn Andreas J.
Wolf Bernd
No associations
LandOfFree
Chemical abundances from Magellanic cloud B stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chemical abundances from Magellanic cloud B stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical abundances from Magellanic cloud B stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1252057