Surface composition changes in massive star evolution with mass loss

Details Surface composition changes in massive star evolution with mass loss Surface composition changes in massive star evolution with mass loss

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92..242n&link_type=abstract

Astronomy and Astrophysics, vol. 92, no. 3, Dec. 1980, p. 242-245.

Astronomy and Astrophysics

Astrophysics

23

Abundance, Astronomical Models, Hot Stars, Late Stars, Stellar Evolution, Stellar Mass Ejection, Carbon, Chemical Composition, Helium, Hydrogen, Nitrogen, O Stars, Oxygen, Stellar Winds

Scientific paper

A series of evolutionary models of 40-100 solar mass objects undergoing mass loss are constructed with the explicit inclusion of the surface composition of H, He, C, N, O elements. Mass loss rates similar to those observed in Of stars, 4 to 7 x 10 to the -6th solar masses/yr, result in an appearance at the surface of equilibrium CNO products, i.e. enhanced nitrogen and diminished carbon, while that star is still burning hydrogen in the core. This result obtains because the initial convection core is a relatively large fraction of the total mass and rather modest loss exposes levels of anomalous composition. It is suggested that these objects might reasonably be identified as those luminous late type WN stars still containing surface hydrogen.

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