International Ultraviolet Explorer observations of Alpha Scorpii

Details International Ultraviolet Explorer observations of Alpha Scorpii International Ultraviolet Explorer observations of Alpha Scorpii

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..644b&link_type=abstract

Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 644-652.

Astronomy and Astrophysics

Astrophysics

15

Absorption Spectra, Iue, Late Stars, Red Giant Stars, Stellar Mass Ejection, Supergiant Stars, Hydrogen, Line Spectra, Spectrum Analysis, Stellar Envelopes, Stellar Models

Scientific paper

IUE observations of the absorption spectrum of Alpha-2 Sco B2.5 V are presented. These lines arise from matter being lost by the red supergiant primary, Alpha-1 Sco M1.5 Iab, which is passing in front of the B star. There is a factor of 30 spread in the hydrogen column densities derived from different elements on the assumption of solar abundance ratios. Possible causes are discussed - observational error, shell chemistry, and interstellar contributions. The mass loss rate from Alpha-1 Sco is dependent on the element chosen as giving the best hydrogen density; an unweighted mean gives a rate of 6.4 x 10 to the -6th solar mass/year.

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