The evolutionary status of OB stars with peculiar nitrogen spectra

Details The evolutionary status of OB stars with peculiar nitrogen spectra The evolutionary status of OB stars with peculiar nitrogen spectra

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..113s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 113-118. Research supported by the Swiss National Sci

Astronomy and Astrophysics

Astrophysics

11

B Stars, Early Stars, Nitrogen, O Stars, Stellar Evolution, Stellar Spectra, Hertzsprung-Russell Diagram, Main Sequence Stars, Mass To Light Ratios, Star Clusters, Stellar Luminosity, Stellar Rotation, Wolf-Rayet Stars

Scientific paper

The majority (60 percent) of OB stars exhibiting nitrogen abundance peculiarities are members of stellar associations. The rate of membership is typical of O and WR stars. Bolometric magnitudes for the 46 known associated peculiar OB stars (25 overabundant and 21 deficient) demonstrated that most of the anomalous stars are the brightest in the associations. Grouping the anomalous stars in an aggregate age-class with the next-brightest stars in the associations and then examining the cluster age reveals that nitrogen-rich OB stars are found in young and old clusters and nitrogen-poor objects are in intermediate age associations. Further details show that 30 solar mass OB have a nitrogen enrichment in the main sequence. Old clusters with nitrogen-rich OB stars can contain blue stragglers, which are also nitrogen-enriched. Some of the nitrogen-enriched stars are WNE progenitors or are a branch of a late evolutionary phase. Finally, nitrogen-rich OB stars are usually hotter than nitrogen-poor OB stars.

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