Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993balta...2..256t&link_type=abstract
Baltic Astronomy, vol. 2, p. 256
Astronomy and Astrophysics
Astronomy
6
Giant Stars, Stellar Color, G Stars, Metallicity, K Stars, Stellar Gravitation, Astronomical Photometry, Semiempirical Equations, Calibrating, Stellar Temperature
Scientific paper
A new semiempirical surface gravity calibration of the intrinsic color indices U-P and U-X of the Vilnius photometric system is presented. It is applicable for giants of all metallicities with temperatures from 4200 K to 5500 K and log g from 0.5 dex to 3.0 dex. The standard deviation of the observed minus predicted log g residuals is about +/- 0.3 dex. The U-P color index is found to be a very good surface gravity indicator, and it can be used for log g determination even when other atmospheric parameters (temperature and metallicity) are poorly known. The main atmospheric parameters for 93 red metal-deficient giants are determined from color indices of the Vilnius system and compared with the evolutionary isochrones.
Lazauskaite Roma
Tautvaisiene Gražina
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