Journal Article

Accurate luminosities from the oxygen λ7771–4 Å triplet and the fundamental parameters of F–G supergiants

V. V. Kovtyukh, N. I. Gorlova and S. I. Belik

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 4, pages 3268-3273
Published in print July 2012 | ISSN: 0035-8711
Published online July 2012 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2012.21117.x
Accurate luminosities from the oxygen λ7771–4 Å triplet and the fundamental parameters of F–G supergiants

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The oxygen λ7771–4 Å triplet is a good indicator of luminosity in A–G supergiants. However, its strength also depends on other atmospheric parameters. In this study, we present the luminosity calibrations where, for the first time, the effects of the effective temperature, microturbulent velocity, surface gravity and the abundance have been disentangled. The calibrations are derived on the basis of a data set of high-dispersion spectra of 60 yellow supergiants with highly reliable luminosities and accurate atmospheric parameters. This allowed us to bring the uncertainty of the triplet-based absolute magnitudes down to 0.26 mag. The calibrations are suitable for spectral types F0–K0 and luminosity classes I–II, covering absolute magnitudes Mv from −1.0 to −10 mag.

Keywords: stars: fundamental parameters; supergiants

Journal Article.  3893 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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