Accurate luminosities from the oxygen 7771-4 A triplet and the fundamental parameters of F-G supergiants

Abstract

The oxygen 7771-4 A 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 dataset of high-dispersion spectra of 60 yellow supergiants with highly reliable luminosities and accurate atmospheric parameters. This allowed 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.

7 pages, accepted to MNRAS

References in corpus (4)

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• The Yellow and Red Supergiants of M33
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• A revised calibration of the Mv-W(OI 7774) relationship using Hipparcos data: Its application to Cepheids and evolved stars

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