Vilnius Paper Abstracts
Straizys V., et al. (1993, Baltic Astr. 2, 326)
Abstract
Colour indices and reddening-free Q-parameters in the Vilnius photometric
system of B-type stars of all luminosities and A-supergiants are
calibrated in terms of effective temperature and surface gravity, using
synthetic spectra of the newest Kurucz model atmospheres. The calibration
is verified by comparing the photometrically determined effective temperatures
and surfaces gravities with the most accurate spectroscopic data.
Satisfactory agreement has been found, proving the accuray of the calibration
within +0.02 to +0.05 dex in log Te and +0.2 to +0.3 dex in log g.
Tautvaisiene G., Lazauskaite R. (1993, Baltic Astr. 2, 256)
Abstract
A new semi-empirical surface gravity calibration of the intrinsic colour
indices U-P and U-X of the Vilnius photometric system is presented. It is
applicable for giants of all metallicities with temperatures from 4200K to
5500K and log g from 0.5 dex to 3.0 dex. The standard deviation of the
observed minus predicted log g residuals is about +0.3dex. The U-P colour
index is found to be a very good surface gravity indicator, and it can be
used for 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 colour indices of the
Vilnius system and compared with the evolutionary isochrones.
Lazauskaite R. (1995, Baltic Astr. 4, 48)
Abstract
Calibrations giving Mv as function of [Fe/H] and various intrinsic color
indices of the Vilnius photometric system are derived for G-K dwarfs and
subdwarfs. The calibration are based only on the stars with known
trigonometric parallaxes and allow one to estimate the absolute magnitudes
with a standard deviation of +-0.6 mag. Comparisons of our calibrations
with the absolute magnitude estimates in the literature show a satisfactory
agreement.
epaunzen@physics.muni.cz
Last update: 7 Novembre 1995