Revising the Evolutionary Stage of HD 163899: The Effects of Convective Overshooting and Rotation

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 ab...

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Bibliographic Details
Published in:The Astrophysical journal 2017-02, Vol.835 (2), p.290
Main Authors: Ostrowski, Jakub, Daszy ska-Daszkiewicz, Jadwiga, Cugier, Henryk
Format: Article
Language:English
Subjects:
ABUNDANCE
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ATMOSPHERES
Atmospheric models
CARBON
LUMINOSITY
MAIN SEQUENCE STARS
MASS
MIXING
Nitrogen
OSCILLATIONS
ROTATION
Rotational spectra
SPECTRA
stars: early-type
stars: individual (HD 163899)
stars: oscillations
Stellar evolution
Stellar oscillations
Stellar rotation
supergiants
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Summary: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 probably belongs to a group of evolved nitrogen-rich main-sequence stars.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/835/2/290