Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..206z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 206-214.
Astronomy and Astrophysics
Astrophysics
49
B Stars, Early Stars, Magellanic Clouds, Peculiar Stars, Stellar Mass Ejection, Supergiant Stars, Astronomical Photometry, Emission Spectra, Line Spectra, Spectrum Analysis
Scientific paper
High-SNR spectra of S 18 were obtained, and UBVRIJHK(L) magnitudes were measured. The line spectra display a forest of narrow emission lines of singly ionized (Si II, Ti II, VII, Cr II, Ni II, and Fe II) and neutral (Fe I and Ca I) metals, along with forbidden emission lines of Fe II, S II and O I. A broad emission feature at 6159 A has been identified as a TiO band. The present results can be explained using a Kurucz (1979) model with an effective temperature of 25,000 K, log g of about 3, and an IR excess due to ff-fb and dust radiation. It is concluded that S18 is a B(e) supergiant with a high velocity wind in the polar region and a slow denser wind in the equatorial region which forms an excretion disk.
Humphreys Roberta M.
Stahl Otmar
Wolf Bernd
Zickgraf Franz-Josef
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