THE WIND OF VARIABLE C IN M33

Journal Article · Thu Feb 20 00:00:00 EST 2014 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/782/2/L21· OSTI ID:22363981

Humphreys, Roberta M.; Davidson, Kris; Gordon, Michael S. ^[1]; Weis, Kerstin; Burggraf, Birgitta; Bomans, D. J. ^[2]

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1. Minnesota Institute for Astrophysics, 116 Church Street SE, University of Minnesota, Minneapolis, MN 55455 (United States)
2. Astronomical Institute, Ruhr-Universitaet Bochum, D-44801 Bochum (Germany)

We discuss the spectrum of Var C in M33 obtained just before the onset of its current brightening and its recent spectra during its present ''eruption'' or optically thick wind stage. These spectra illustrate the typical luminous blue variable (LBV) transition in apparent spectral type or temperature that characterizes the classical LBV or S Dor-type variability. LBVs are known to have slow, dense winds during their maximum phase. Interestingly, Var C had a slow wind even during its hot, quiescent stage in comparison with the normal hot supergiants with similar temperatures. Its outflow or wind speeds also show very little change between these two states.

• OSTI ID: 22363981
• Journal Information: Astrophysical Journal Letters, Vol. 782, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COMPARATIVE EVALUATIONS
ERUPTION
STELLAR WINDS
SUPERGIANT STARS
VARIABLE STARS
VELOCITY