Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..343c&link_type=abstract
New Astronomy Reviews, Volume 43, Issue 5, p. 343-387.
Astronomy and Astrophysics
Astronomy
14
Scientific paper
The Geneva seven-colour photometric system has been applied for almost four decades. Its data bank presently contains 345 000 measurements of 47 600 stars of all types. About 40% of the latter are of types O, B and first A. The light of these bright and massive stars is practically without exception extinguished by interstellar dust. Here, we describe various calibrations made in a three-dimensional orthogonal reddening-free representation of the system, optimised for B-stars, and that separates temperature and gravity effects. Central to all calibrations lies the empirical determination of the intrinsic colours, described here in some detail. Comparisons with synthetic photometry are made. Calibrations for effective temperature, bolometric correction, absolute magnitude are discussed as well as correlations with MK type, standard U,B,V photometry and the Strömgren /β index. The unavoidable limitations imposed upon photometry by undetected causes of scatter, such as in binary systems, are evaluated. Open questions and future prospects are mentioned.
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