Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100...97g&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 97-106.
Astronomy and Astrophysics
Astrophysics
43
Atmospheric Models, G Stars, Main Sequence Stars, Spectrum Analysis, Stellar Atmospheres, Stellar Temperature, Abundance, Balmer Series, Calibrating, Sun
Scientific paper
Effective temperatures for the atmospheres of solar-type stars have been determined by comparison of observed hydrogen lines with profiles computed from scaled solar model atmospheres. The analysis is based on more than one hundred high-dispersion spectra of 20 main sequence stars with spectral types F6 V to G5 V and calibrated directly with spectra of the sun, moon, and daylight sky. For early G-type stars the resulting spectroscopic temperature scale deviates considerably from color-temperature relations derived from synthesis of theoretical color indices using model atmospheres with statistical line distribution functions. The spectroscopic calibration yields effective temperatures for G-type stars that are about 200-300 K higher than those predicted from comparison of observed and synthesized color indices.
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