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Title:
A study of mass loss from the mid-ultraviolet spectrum of Alpha Cygni /A2 Ia/, Beta Orionis /B8 Ia/, and Eta Leonis /A0 Ib/
Authors:
Lamers, H. J. G. L. M.; Stalio, R.; Kondo, Y.
Affiliation:
AA(Osservatorio Astronomico, Trieste, Italy), AB(Osservatorio Astronomico, Trieste, Italy), AC(NASA, Johnson Space Center, Houston, Tex; NASA, Goddard Space Flight Center, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 1, vol. 223, July 1, 1978, p. 207-220. (ApJ Homepage)
Publication Date:
07/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Stellar Evolution, Stellar Mass Ejection, Supergiant Stars, Ultraviolet Spectra, Early Stars, Late Stars, Stellar Envelopes, Stellar Spectrophotometry
DOI:
10.1086/156252
Bibliographic Code:
1978ApJ...223..207L

Abstract

Results are presented for a study of mass loss from A and late-B supergiants based on high-resolution mid-UV spectra obtained with the echelle spectrograph of the Balloon-borne Ultraviolet Stellar Spectrometer. Spectra of Alpha Cyg, Beta Ori, Eta Leo, and Alpha Lyr are compared in selected wavelength regions; particular attention is given to previous observations of each star, the Mg II and Fe II resonance lines, lines due to other ions, and evidence for mass ejection. The results indicate that mass loss from late-B and A supergiants is variable, that a considerable fraction of envelope material is ejected in 'puffs', and that the puffs may be due to photospheric instabilities. A mass-loss rate of about 1 hundred-millionth of a solar mass per year is derived for Alpha Cyg and shown to be two orders of magnitude smaller than the value determined from the observed IR excess. This discrepancy is attributed to excess ionization in the envelope.

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