The chemical compositions of three main-sequence B-type stars in the Large Magellanic Cloud.

Details The chemical compositions of three main-sequence B-type stars in the Large Magellanic Cloud. The chemical compositions of three main-sequence B-type stars in the Large Magellanic Cloud.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315...95r&link_type=abstract

Astronomy and Astrophysics, v.315, p.95-104

Astronomy and Astrophysics

Astrophysics

36

Galaxies: Magellanic Clouds, Stars: Abundances, Galaxies: Abundances, Stars: Individual: Lh 104-24 (Lmc, Association Lh 104), Ps 34-16 (Lmc, [Ps79] 34-16), Ps 34-144 (Lmc, [Ps79] 34-144)

Scientific paper

High-resolution observations of three B-type main-sequence stars in the Large Magellanic Cloud (LMC) have been obtained with the UCL echelle spectrograph on the 3.9-m Anglo-Australian Telescope. These spectra and IUE low-resolution spectroscopic data have been analysed using LTE model-atmosphere techniques, to derive stellar atmospheric parameters and chemical compositions. As these stars lie on the hydrogen burning main-sequence, their surface abundances should reflect those of the present-day interstellar medium. From a differential analysis of LH 104-24 and PS 34-16 performed relative to the Galactic B-type stars τ Sco and γ Peg, we conclude that there exists a general heavy-element underabundance of ~0.3dex within the LMC, but there is some evidence to suggest that these stars possess different oxygen and silicon abundances. The third star, PS 34-144, exhibits chemical anomalies, with a helium underabundance of 0.5dex and a mean metal deficiency of approximately 0.8dex. We classify this object as a Helium-weak star that is a member of the LMC. However, as additional processes such as diffusion may have occurred in its atmosphere, we do not believe that element abundances derived for PS 34-144 to be representative of the progenitor interstellar material.

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