Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..239s&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 239-242 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Early Stars, Peculiar Stars, Supergiant Stars, Ultraviolet Spectra, Visible Spectrum, Balmer Series, Helium, Magellanic Clouds, Nitrogen, Stellar Composition, Stellar Models
Scientific paper
Optical (3600 to 10,000 A) and IUE (1200 to 3200 A) observations of the peculiar, luminous early-type supergiant star S 18/SMC which cover the period 1981 to 1983 are presented. This is supplemented by objective prism and high dispersion studies from 1967 to 1983. The HeII 4686 line is variable in the optical, with HeII 1640, CIV 1550 and NV 1245 also variable. The FES magnitude data suggest that the photometric variations are less than 0.1 (m) P Cygni profiles are observed on the hydrogen lines to H9, and HeI, FeII, FeII, NIII, and weak SiII are seen in the optical spectrum. The red CaII lines are strong in 1983. There is no evidence for a red companion. The UV spectrum is dominated by emission lines of nitrogen. The variations show a striking similarity to HV475, and the UV spectrum and derived N enhancement is quite similar to Sanduleak's star in the LMC. Evidence for a nitrogen overbundance of a factor of the order of 70 is presented and a preliminary stellar wind model for the star is discussed.
Allen David A.
Sanduleak Nicholas
Shore Steve N.
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