Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..372s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 2, Oct. 1985, p. 372-390. Research supported by the Swedish Board for
Astronomy and Astrophysics
Astronomy
174
Calibrating, Dwarf Stars, F Stars, Stellar Color, Stellar Temperature, Errors, G Stars, H Beta Line, Infrared Astronomy, Solar Temperature, Stellar Magnitude
Scientific paper
An effective temperature calibration is presented which allows effective temperatures for F and early G dwarfs to be determined from the b-y or B-V color indices or the H-beta index with an absolute uncertainty of only 75 K, and with even greater accuracy in differential work. The calibration is based on observed integrated fluxes and estimates of angular diameters, using the IR flux method proposed by Blackwell and Shallis (1977), and is almost independent of model atmospheres. The method is used to derive new absolute calibrations of the 13-color photometric system of Johnson and Mitchell (1975) and of the IR J, K, and L magnitudes of Johnson (1965). The calibration supports the theoretical calibration of the b-y color obtained by Gustafsson et al. (1975), at least for temperatures below 6400 K, while indicating that the colors of Relyea and Kurucz (1978) are not reliable.
Hammarback G.
Saxner M.
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