Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.2516a&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 106, no. 6, p. 2516-2523
Astronomy and Astrophysics
Astronomy
16
Astronomical Photometry, Calibrating, Stellar Magnitude, Supergiant Stars, Ubv Spectra, Astronomical Spectroscopy, Comparison, Iron, Spectrum Analysis, Stellar Gravitation
Scientific paper
New calibrations of the absolute magnitude Mv from O I 7774 data are derived from narrow-band photometry and low dispersion spectroscopy for AO-G2 low and high luminosity stars. The nonlinear dependence of Mv from the equivalent width W(OI) and the relevance of the stellar temperature in the calibration are confirmed in agreement with previous calibrations obtained from high resolution spectroscopy. Also functional formulas to estimate (Fe/H) and log g from uvby-beta data for FO-G3 supergiants are offered. These calibrations predict iron abundances and gravities for yellow supergiants with uncertainties not much higher than good spectroscopic determinations.
Arellano Ferro Armando
Mendoza Eugenio E. V.
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