Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...81..237m&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 81, no. 2, Dec. 1989, p. 237-252.
Astronomy and Astrophysics
Astrophysics
55
B Stars, Main Sequence Stars, O Stars, Open Clusters, Stellar Composition, Stellar Spectra, Carbon, Early Stars, Line Spectra, Nitrogen, Stellar Evolution
Scientific paper
The properties of the stars close to the upper main sequence of OB associations are studied in order to provide constraints on the theory of evolution of massive stars. The spectral classification of northern single-lined O stars, most of them belonging to the associations Cyg OB1, Per OB1 and Cas OB6, is presented. The classification is performed according to Conti's classification scheme for O stars, amended by Mathys (1988). The behavior of the C and N lines of the stars is studied, in order to determine whether CNO-processed material is visible at their surface. Three new ON stars have been discovered: BD + 36 deg 4063 (O9.71), HD 13268 (O8V), and HD 110360 (O7V).
No associations
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