On the nature of Cygnus OB2 number 12

Details On the nature of Cygnus OB2 number 12 On the nature of Cygnus OB2 number 12

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l..87s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Jan. 15, 1980, p. L87-L90.

Astronomy and Astrophysics

Astrophysics

27

B Stars, Stellar Luminosity, Stellar Spectrophotometry, Variability, Absorption Spectra, Balmer Series, H Alpha Line, Reference Stars, Star Clusters, Stellar Mass Ejection

Scientific paper

Observations of the luminous late B star No. 12 in the Cygnus OB2 Association, and of the B7 Ia star HD 183143 are presented. The classification of No. 12 as B8 Ia is confirmed. Evidence is found for spectral and radial velocity variability, consistent with No. 12 being a very luminous star undergoing mass loss and a bona fide member of the association. Possible duplicity is pointed out. A sharp absorption feature at wavelength of 6532 A, sometimes present in the spectrum of No. 12, remains unidentified.

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