A UVBY beta survey of northern-hemisphere active binaries. I - The observations

Details A UVBY beta survey of northern-hemisphere active binaries. I - The observations A UVBY beta survey of northern-hemisphere active binaries. I - The observations

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...71..421r&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 71, no. 3, Dec. 1987, p. 421-429.

Astronomy and Astrophysics

Astronomy

19

Binary Stars, Sky Surveys (Astronomy), Stellar Activity, Ubv Spectra, Astronomical Catalogs, Calibrating, H Beta Line, Late Stars, Stellar Magnetic Fields

Scientific paper

A recent detailed calibration of the uvby photometric system for late-type stars has opened the possibility of studying photometric effects of stellar activity in the RS CVn group of binaries. A uvbyβ photometric study of 72 northern-hemisphere binary systems with active chromospheres has been carried out at the Roque de los Muchachos Observatory (La Palma, Canary Islands) with a People's photometer attached to the JKT 1.0 m telescope. The standardized colours and V magnitudes are presented as a function of the orbital phase, along with an indication of their accuracy. A detailed discussion of atmospheric extinction, characteristics of the photometric system and transformation coefficients is also included.

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