Empirical effective temperatures and angular diameters of stars cooler than the sun

Details Empirical effective temperatures and angular diameters of stars cooler than the sun Empirical effective temperatures and angular diameters of stars cooler than the sun

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..315d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 315-334.

Astronomy and Astrophysics

Astrophysics

82

Angular Distribution, Cool Stars, Stellar Atmospheres, Stellar Temperature, Diameters, Late Stars, Semiempirical Equations

Scientific paper

Empirical correlations of stellar surface brightness F(v) as a function of the Johnson's broadband (V-K)-color have been investigated by using a selected sample of 44 stars cooler than the sun with most of angular diameters accurately measured by modern Michelson interferometry. A linear correlation is found to well represent the brightness of G-K stars almost independently of their luminosity class. But the function is split in two fairly different branches of the giants and supergiants in the M spectral range. The calibration of supergiants enhances a tighter linear correlation which also spans the M-type stars. It appears unaffected by interstellar extinction and closely represents the behavior of several other cool objects such as M-dwarfs, carbon stars, and Mira-variables at their maximum phase. The photometric (F, V-K)-calibration is applied for inferring stellar angular dimensions and effective temperatures. The empirical (Te, V-K)-relationship of such stars is found to be in excellent agreement with the previous (Te, V-K) calibration for giants in the G-K spectral range and with the narrowband color temperature calibration in the M range. A reliable effective temperature of 3620 +/- 90 K is derived for the well-studied M-supergiant Alpha Ori by careful discussion of the actual temperature scale.

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