Fundamental parameters of Wolf-Rayet stars. III. The evolutionary status of WNL stars.

Details Fundamental parameters of Wolf-Rayet stars. III. The evolutionary status of WNL stars. Fundamental parameters of Wolf-Rayet stars. III. The evolutionary status of WNL stars.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293..427c&link_type=abstract

Astronomy and Astrophysics 293, 427-445 (1995)

Astronomy and Astrophysics

Astrophysics

121

Stars: Abundances, Evolution, Mass-Loss, Wolf-Rayet

Scientific paper

New high S/N optical observations of 9 Galactic WNL (WN7-8) stars are presented. The spectra have been analysed using tailored non-LTE model atmospheres by Crowther et al. (1994c). Here we use the derived stellar parameters and abundances for a thorough investigation of the evolutionary status and mass-loss properties of WNL stars. We have identified two distinct groups of WNL stars from their observed properties. The WNL+abs and WN7 stars have high luminosities (log L/Lsun_~5.9) and form a continuity in morphology and physical parameters from the Of stars. They appear to be intimately related to these stars, confirming the suspicion of Walborn (1973) and are descended from extremely massive progenitors (M_initial_>60Msun_) through the sequence O->Of->WNL+abs->WN7(->WNE)->WC->SN. In contrast, the evolutionary sequence for WN8 stars is identified as O->LBV or RSG->WN8->WNE->WC->SN. These stars, with lower luminosities (log L/Lsun_~5.5), are descended from less massive stars, and have either red supergiant (RSG, 25Msun_

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