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The peculiar early-type emission line supergiant S 18/SMC - An optical and ultraviolet studySpectroscopic observations of S 18/SMC, obtained in the visible at CTIO, the AAT, and ESO and in the UV with the IUE SWP and LWR instruments during 1978-1983, are reported. The data are presented in tables and spectra and characterized in detail. The variability of the object in He II, C IV, N IV, N V, and Si IV and the lack of detectable photometric variation between 120 and 1000 nm are discussed in terms of a stellar-envelope model with mass-loss rate greater than or equal to 0.00001 solar mass/yr and N abundance 3-5 times the solar value, corresponding to a transitional phase between extreme mass loss (near the Humphrey-Davidson limit) and the presupernova stage. The FUV flux is tentatively attributed to an extremely hot He-star or neutron-star companion.
Document ID
19870060864
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shore, S. N.
(New Mexico Institute of Mining and Technology Socorro; Meudon, Observatoire, France)
Sanduleak, N.
(Warner and Swasey Observatory Cleveland, OH, United States)
Allen, D. A.
(Anglo-Australian Observatory Epping, Australia)
Date Acquired
August 13, 2013
Publication Date
April 1, 1987
Publication Information
Publication: Astronomy and Astrophysics
Volume: 176
Issue: 1 Ap
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
87A48138
Funding Number(s)
CONTRACT_GRANT: NAG5-179
Distribution Limits
Public
Copyright
Other

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