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

Abstract

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.

Authors:
; ;  [1]
  1. Instytut Astronomiczny, Uniwersytet Wrocławski, ul. Kopernika 11, 51-622 Wrocław (Poland)
Publication Date:
OSTI Identifier:
22663965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 835; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; ATMOSPHERES; CARBON; LUMINOSITY; MAIN SEQUENCE STARS; MASS; MIXING; OSCILLATIONS; ROTATION; SPECTRA

Citation Formats

Ostrowski, Jakub, Daszyńska-Daszkiewicz, Jadwiga, and Cugier, Henryk, E-mail: ostrowski@astro.uni.wroc.pl. Revising the Evolutionary Stage of HD 163899: The Effects of Convective Overshooting and Rotation. United States: N. p., 2017. Web. doi:10.3847/1538-4357/835/2/290.
Ostrowski, Jakub, Daszyńska-Daszkiewicz, Jadwiga, & Cugier, Henryk, E-mail: ostrowski@astro.uni.wroc.pl. Revising the Evolutionary Stage of HD 163899: The Effects of Convective Overshooting and Rotation. United States. doi:10.3847/1538-4357/835/2/290.
Ostrowski, Jakub, Daszyńska-Daszkiewicz, Jadwiga, and Cugier, Henryk, E-mail: ostrowski@astro.uni.wroc.pl. Wed . "Revising the Evolutionary Stage of HD 163899: The Effects of Convective Overshooting and Rotation". United States. doi:10.3847/1538-4357/835/2/290.
@article{osti_22663965,
title = {Revising the Evolutionary Stage of HD 163899: The Effects of Convective Overshooting and Rotation},
author = {Ostrowski, Jakub and Daszyńska-Daszkiewicz, Jadwiga and Cugier, Henryk, E-mail: ostrowski@astro.uni.wroc.pl},
abstractNote = {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.},
doi = {10.3847/1538-4357/835/2/290},
journal = {Astrophysical Journal},
number = 2,
volume = 835,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}