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The ultraviolet to infrared spectrum of the large mass loss LMC supergiant S22 = HD 34664+

Published online by Cambridge University Press:  12 April 2016

G. Muratorio ,
S. Bensammar ,
A. Cassatella ,
M. Friedjung  and
R. Viotti
G. Muratorio
Affiliation:
Observatoire de Marseille, Marseille, France
S. Bensammar
Affiliation:
DEPEG, Observatoire de Meudon, Meudon, France
A. Cassatella
Affiliation:
ESA, Astronomy Division, Villafranca Satellite Tracking Station, Villafranca, Madrid, Spain
M. Friedjung
Affiliation:
Institut d'Astrophysisque, CNRS, Paris, France
R. Viotti
Affiliation:
Istituto Astrofisica Spaziale, CNR, Frascati, Italy

Extract

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S22 is a peculiar supergiant in the Large Magellanic Cloud whose optical spectrum is characterized by numerous emission lines including Fell and [Fell] (Muratorio 1978). A detailed study performed by Friedjung and Muratorio (1980) led to two main conclusions: (a) A wind with a velocity of 70 km s-1 and a mass loss rate between 4x10-6 and 5x10-5 Mʘ yr-1 is suggested by the examination of the Balmer line P Cygni profiles, (b) The Fell and [Fell] emission lines come from a different region which is optically very thick in the permitted lines. Emission line curve-of-growth methods indicated that the region of line formation has a surface area perpendicular to the line of sight equal to that of a disk perpendicular to this direction with a radius between 3x1013 and 3x1014cm.

Type
Session V - Mass Loss and Stellar Evolution: Massive Stars
Information
International Astronomical Union Colloquium , Volume 59: Effects of Mass Loss on Stellar Evolution , 1981 , pp. 271 - 274
Copyright
Copyright © Reidel 1981

Footnotes

+

Based on observations by the International Ultraviolet Explorer collected at the Villafranca Satellite Tracking Station of ESA, and on observations made at the European Southern Observatory, La Silla.

References

Bath, G.T., Pringle, J.E., Whelan, A.J. 1980, Mon. Not. R.A.S. 190, 185 CrossRefGoogle Scholar
Friedjung, M., Muratorio, G. 198O, Astron. Astrophys. 85, 233 Google Scholar
Muratorio, G. 1978, Astron. Astrophys. Suppl. Ser. 33, 125 Google Scholar