Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.374.1549w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 374, Issue 4, pp. 1549-1556.
Astronomy and Astrophysics
Astronomy
9
Stars: Fundamental Parameters
Scientific paper
The absolute visual magnitudes, MV, of A-M stars are based on calculated Hipparcos trigonometric parallaxes. The sample used consists of 30986 unreddened and reddened A-M stars in luminosity classes Ia, Iab, Ib, II, III, IV and V. The colour excesses of the reddened stars were calculated using the mean colour indices, according to the SIMBAD data base and the intrinsic B - V values calibrated for the given spectral types and luminosity classes by Schmidt-Kaler. The values of the total-to-selective extinction, RV = AV/E(B - V), for all the reddened stars were calculated from previously published near-infrared photometric measurements. The calculated visual magnitudes, MV, of A-M stars compare with the earlier determinations of Schmidt-Kaler. The mean absolute magnitudes published by Schmidt-Kaler are generally brighter (except for the stars in luminosity classes V and IV) than those determined in this paper.
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