Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..719z&link_type=abstract
Astrophysical Journal, Part 1, vol. 259, Aug. 15, 1982, p. 719-722.
Astronomy and Astrophysics
Astrophysics
3
B Stars, Eclipsing Binary Stars, Infrared Spectra, Stellar Spectra, Variable Stars, Line Spectra, Stellar Atmospheres, X Ray Sources
Scientific paper
Spectra of several eclipses of Algol in the range 10500-11000 A where the line contribution of Algol B is important, are presented. Strong unshifted 10830 (2000 mA) absorption peaks at primary minimum but disappears between phases 0.3 and 0.7. At minimum the line must primarily arise in Algol B, but the presence of 10830 absorption just outside eclipse, when the contribution to the total light of Algol B is small, must be due to excitation of He in the atmosphere of the primary by X-ray irradiation from Algol B, a known X-ray source. A Si I line from Algol B is also detected, and the Pa-gamma line sometimes peaks during eclipse. Even if some of the 10830 absorption comes from Algol A, Algol B still has the strongest 10830 (3000 mA) yet measured in any star.
Liggett M. A.
Zirin Harold
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