Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176...59s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 1, April 1987, p. 59-68.
Astronomy and Astrophysics
Astronomy
18
Magellanic Clouds, Peculiar Stars, Stellar Spectra, Supergiant Stars, Emission Spectra, Line Spectra, Optical Measurement, Stellar Mass Ejection, Ultraviolet Astronomy
Scientific paper
The authors have observed the extreme early-type emission line star S18/SMC during 1978 to 1983 with both optical and ultraviolet low and moderate dispersion spectra. The star is a pronounced variable in He II, C IV, N IV, N V and Si IV. There appear to be no associated photometric variations from λλ1200 to 10,000 Å. A model is presented for the envelope of this star, and it is argued that the mass loss rate is comparable to or greater than any of the stars in the IUE survey by Shore and Sanduleak (of order 10-5M_sun;yr-1). The nitrogen abundance is found to be considerably enhanced above solar, and indication of substantial mixing of processed material from the interior. Comparisons are drawn to a number of other stars with similar emission characteristics.
Allen David A.
Sanduleak Nicholas
Shore Steve N.
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