The upper main sequence of OB associations. I - Spectral types and lines of C and N of southern single-lined O stars

Details The upper main sequence of OB associations. I - Spectral types and lines of C and N of southern single-lined O stars The upper main sequence of OB associations. I - Spectral types and lines of C and N of southern single-lined O stars

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...76..427m&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 76, no. 3, Dec. 1988, p. 427-444.

Astronomy and Astrophysics

Astrophysics

87

Abundance, Blue Stars, Carbon, Nitrogen, O Stars, Stellar Spectra, Astronomical Catalogs, Evolution, Spectral Line Width, Stellar Luminosity

Scientific paper

The single-line O stars belonging to the southern associations Vel OB1, Car OB1, Cen OB1, and Sco OB1 are studied. Their spectral type is derived in Conti's classification scheme for O stars, amended to include the O9.7 subtype and to deal with fairly high S/N CCD spectra. The behavior of the C and N lines of these stars is studied in order to determine whether CNO-processed material is visible at their surface.

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