Jakub Ostrowski, Jadwiga Daszyńska-Daszkiewicz, Henryk Cugier
Published 2016-12-23Version 1
We revise the evolutionary status of the B-type supergiant HD\,163899 based on the new determinations of the mass-luminosity ratio, effective temperature and rotational velocity as well as on the interpretation of the oscillation spectrum of the star. The observed value of the nitrogen-to-carbon abundance fixes the value of the rotation rate of the star. Now, more massive models are strongly preferred than those previously considered and it is very likely that the star is still in the main sequence stage. The rotationally induced mixing manifests as the nitrogen overabundance in the atmosphere, which agrees with our analysis of the HARPS spectra. Thus, HD\,163899 belongs probably to a group of evolved nitrogen-rich main-sequence stars.
Comments: 15 pages, 10 figures, accepted for publication in ApJ
Convection and convective overshooting in stars more massive than 10 $M_\odot$
Comment on the feasibility of carbon burning in Betelgeuse: a response to "The evolutionary stage of Betelgeuse inferred from its pulsation periods," arXiv:2306.00287
The evolutionary stage of Betelgeuse inferred from its pulsation periods
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