Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277...10r&link_type=abstract
Astronomy and Astrophysics, Vol. 277, NO. 1/SEP(III), P. 10, 1993
Astronomy and Astrophysics
Astrophysics
42
Scientific paper
High-resolution echelle spectra of three main-sequence B-type stars and one B-type giant in the Small Magellanic Cloud (SMC) have been obtained using the 3.9 m Anglo-Australian Telescope. These spectra have been analyzed in conjunction with IUE low-resolution spectra by using LTE model atmosphere techniques, to derive the stellar atmospheric parameters and photospheric chemical compositions; the latter should reflect that of the current interstellar medium within the SMC. From a differential analysis performed relative to the Galactic B-type stars τ Sco and 67 Oph, the SMC stars appear to have a mild helium deficiency (of 0.1-0.2 dex), and a general heavy element depletion of approximately -0.8 dex. Nitrogen is found to be significantly more underabundant (< -1.1 dex) and oxygen is possibly less depleted (-0.5 dex) than the average. There is also marginal evidence for variations in the chemical compositions derived for different stars, suggesting that the interstellar medium of the SMC may not be homogeneous.
Dufton Philip L.
Fitzsimmons Alan
Howarth Ian D.
Irwin Mary Jane
Rolleston William Robert J.
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