Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..330c&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 2, Aug. 1982, p. 330-336.
Astronomy and Astrophysics
Astrophysics
47
B Stars, Stellar Color, Stellar Spectrophotometry, Ubv Spectra, A Stars, Data Smoothing, Early Stars, Interstellar Extinction, Magnetic Stars, O Stars, Peculiar Stars, Stellar Atmospheres
Scientific paper
Estimators of the intrinsic Geneva (U-B and (B-V) colors of O,B, and early A-type stars with log greater than or equal to 3.5 are derived empirically in the three-parameter reddening-free (X,y,Z) representation. These parameters resolve the effects of temperature and gravity (i.e., MK types, parameters X and Y) as also of magnetic fields (Ap phenomenon, parameter Z). The estimators are shown to be affected essentially in the same sense as the true (U,B,V) colors by variations of the main astrophysical quantities. The intrinsic colors are thus correctly reproduced regardless of prior knowledge concerning evolutionary status, duplicity, rotational velocity or Ap characteristics of the stars observed. The empirical relations are shown to be in excellent agreement with Kurucz's (1979) atmosphere models, and the MK-type vs. X, Y, (U-B)0, (B-V)0, relations are given.
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