Title: Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants
Authors: Kovtyukh, V. V ×
Gorlova, Nadiya
Belik, S. I #
Issue Date: 2012
Publisher: Priestley and Weale
Series Title: Monthly Notices of the Royal Astronomical Society vol:423 issue:4 pages:3268-3273
Abstract: 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.
ISSN: 0035-8711
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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