Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...8930149n&link_type=abstract
Unknown
Physics
A Stars, B Stars, Calibrating, Stellar Gravitation, Stellar Mass, Stellar Spectrophotometry, Stellar Temperature, Infrared Photometry, Interstellar Extinction, Main Sequence Stars, Metallicity, Spectrophotometers, Stellar Atmospheres, Stellar Models
Scientific paper
A semi empirical calibration of the two reddening-free parameters X and Y of Geneva photometry in terms of effective temperature, metallicity, mass and surface gravity is proposed. The calibration is based on Kurucz's grid of atmosphere models and on a set of fundamental stars; it is valid for main sequence stars with an effective temperature (Te) approx. greater than 10000 K. The model can be applied to cooler stars, but becomes uncertain for X greater than 1.6. The lack of fundamental stars with log g less than 4.0 makes the calibration less reliable for evolved stars. Theoretical evolutionary tracks are used to calibrate the Y vs X diagram in terms of stellar mass, for M approx. greater than 2.5 to 3.0 of the solar mass. The mass of stars with a solar metallicity is estimated in the range 2.5 to 15 of the solar mass.
Nicolet Bernard
North Pierre
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