Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69..829b&link_type=abstract
Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 69, no. 4, p. 829-841.
Astronomy and Astrophysics
Astronomy
5
Metal Hydrides, Red Giant Stars, Stellar Atmospheres, Stellar Luminosity, Stellar Spectra, Calibrating, Magnesium Compounds, Molecular Spectra
Scientific paper
The possibility of using MgH lines as a gravity criterion for red giant atmospheres is considered. The effective temperatures of 12 K0-K3 giants are determined from (V-K) colors, and the gravities are obtained from a comparison of observed and calculated equivalent widths of MgH features with wavelengths of 5134.6, 5138.7, and 5140.2 AA. The results of an investigation of the influence of some parameters (microturbulence, macroturbulence, metallicity, and abundance of Mg) on the calculated MgH line profiles are discussed. Calibration diagrams for determining the gravities of red giants with effective temperatures from 4000 to 5000 K from the equivalent widths and the central intensities of MgH lines are proposed.
Berdyugina Svetlana V.
Savanov I. S.
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