Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..235h&link_type=abstract
Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 235-243.
Astronomy and Astrophysics
Astrophysics
10
Calibrating, Late Stars, Maximum Likelihood Estimates, Statistical Analysis, Stellar Luminosity, Interstellar Extinction, Main Sequence Stars, Parallax, Stellar Magnitude, Stellar Motions, Tables (Data)
Scientific paper
A statistical parallax method based on the principle of maximum likelihood is used to calibrate absolute luminosities for samples of cooler stars constituting the 'late group' defined by Stromgren (1966). The samples examined include 415 stars of all luminosity classes and a subset comprising 86 main-sequence stars. Linear calibration relations involving the Stromgren beta, (b-y), and bracketted c1 indices are derived which yield mean absolute magnitudes with an accuracy of 0.09 magnitude for the overall sample and 0.13 magnitude for the main-sequence subsample. Several second-order relations are considered, and the results are compared with Crawford's (1975) calibrations as well as with mean absolute magnitudes obtained from trigonometric parallaxes. The possible effect of interstellar absorption on the calibration relations is also investigated.
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