The evolution of a 20 solar mass rotating star: Abundance anomalies in OBN stars in the LMC

Details The evolution of a 20 solar mass rotating star: Abundance anomalies in OBN stars in the LMC The evolution of a 20 solar mass rotating star: Abundance anomalies in OBN stars in the LMC

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..485e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 485-492

Astronomy and Astrophysics

Astrophysics

8

Abundance, Anomalies, B Stars, Magellanic Clouds, Nitrogen, O Stars, Stellar Evolution, Stellar Rotation, Mixing Ratios, Stellar Atmospheres, Stellar Composition, Stellar Interiors

Scientific paper

Evolutionary study of a rotating 20 solar mass star with a chemical composition appropriate for the Large Magellanic Cloud (LMC) has been carried out starting from the threshold of stablility through the gravitational phase, approach to the main-sequence, on the hydrogen burning phase, up to the point at which 61% of hydrogen was consumed in the central region of the star. During evolution mixing due to diffusion has been taken into account. As a consequence of such a mixing it has been shown that the atmosphere of the star was enriched the most conspicuously in helium and nitrogen. Thus it was concluded that rotational mixing helps the star to expose processed matter at its surface. When compared with the observations of nitrogen rich early type stars, our results agree well with the observed chemical composition of the OBN stars, if not quantitatively but at least qualitatively.

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