Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..335h&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 3, June 1978, p. 335-342.
Astronomy and Astrophysics
Astrophysics
12
F Stars, Hot Stars, Stellar Luminosity, Stellar Magnitude, Parallax, Statistical Analysis, Stellar Spectra, Tables (Data)
Scientific paper
Luminosity calibrations are performed for a restricted sample of 706 F-type field stars of all luminosity classes and a similarly restricted sample of 251 main-sequence F stars. The samples are restricted with respect to values of photometric and metallicity indices, proper motions, radial velocities, and apparent magnitudes. Both linear and second-order relations between absolute magnitude and the photometric indices beta, /c1/ or (b-y), /c1/ are considered. These relations are calibrated by the statistical parallax method based on the principle of maximum likelihood. The possible effect of interstellar absorption on the calibration results is investigated along with an effect of a photometric correction to the absolute magnitudes. The results obtained are compared with those of Crawford (1975) as well as with the trigonometric parallaxes. The coefficients of the calibration relations are derived from the trigonometric parallaxes, and poor agreement is indicated. It is concluded that the trigonometric parallaxes must be used very carefully and only for nearby stars.
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