Large Variations in the Winds of Single Cool Giants: lambda Velorum and gamma Crucis

Details Large Variations in the Winds of Single Cool Giants: lambda Velorum and gamma Crucis Large Variations in the Winds of Single Cool Giants: lambda Velorum and gamma Crucis

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...495..927m&link_type=abstract

Astrophysical Journal v.495, p.927

Astronomy and Astrophysics

Astronomy

10

Stars: Mass Loss, Stars: Late-Type, Ultraviolet: Stars, Line: Profiles

Scientific paper

UV spectra of the "noncoronal" single K supergiant lambda Vel and of the single M giant gamma Cru obtained with IUE and the Hubble Space Telescope at various epochs indicate that the profiles of many lines formed in the wind exhibit striking alterations in shape with time. We parameterize the wind profiles in terms of an empirical optical depth tau emp by reflecting the red wing about line center and comparing the reflected intensity with that of the blue wing. In the lambda Vel wind the terminal velocity v∞ was found to be close to 40 km s-1 in 1978, 1982, and 1994, but was at least 20 km s-1 greater in 1990. The faster wind in 1990 also had a total optical depth that was a factor of 2-6 times greater than at the other epochs.

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