Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43..111h&link_type=abstract
Astronomy and Astrophysics, vol. 43, no. 1, Sept. 1975, p. 111-126. Research supported by the Fondation Agathon de Potter.
Astronomy and Astrophysics
Astrophysics
9
A Stars, Light Curve, Main Sequence Stars, Stellar Luminosity, Ubv Spectra, Astronomical Photometry, Calibrating, Interstellar Extinction, Magnitude, Parallax, Red Shift, Star Clusters, Star Distribution, Statistical Analysis, Stellar Evolution
Scientific paper
A relation defining the luminosity index for Stroemgren's (1966) intermediate group (A0 to A3 stars) in terms of absolute magnitude is calibrated using a method based on the principle of maximum likelihood. This relation is also calibrated for the case when the 'a' index is corrected for reddening. For both relations, calculations are made of the magnitude dispersion, the mean velocity components and corresponding dispersion, and the precision of each parameter. The results are shown to be in fairly good agreement with Stroemgren's (1966) values, and a relation incorporating the corrected 'a' index is proposed for main-sequence stars. The absolute magnitudes obtained with a relation of the present type are compared with those derived from trigonometric parallaxes and with those obtained by Eggen (1972).
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