Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pazh...12..380z&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal, Vol. 12:5, P. 380, 1986
Astronomy and Astrophysics
Astronomy
2
Scientific paper
It is shown that the dependence of colour indices B-V and U-B on the V-brightness has a heterogeneous character. The V-brightness decreases from its maximum (9m.4) to some intermediate value (10m.6) is accompanied by the increase of colour indices with their following decrease when the brightness drops up to V ≈ 11m.7. Such a dependence, found earlier for several irregular variable stars, indicates to a relation of these two types of variables.
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