Four colour photometry of late-type binary systems. I. First UVBY beta light curves of ZZ Ursae Majoris

Details Four colour photometry of late-type binary systems. I. First UVBY beta light curves of ZZ Ursae Majoris Four colour photometry of late-type binary systems. I. First UVBY beta light curves of ZZ Ursae Majoris

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..123....1c&link_type=abstract

A & A Supplement series, Vol. 123, May II 1997, 1-4.

Astronomy and Astrophysics

Astronomy

7

Stars: Binaries: Eclipsing, Stars: Late-Type, Stars: Individual: Zz Uma, Stars: Fundamental Parameters

Scientific paper

This paper presents first complete uvby light curves of the late-type detached eclipsing binary ZZ UMa (G0V + G8V, P=2.2993 deg). This binary system has been observed during eight campaigns at the Calar Alto Observatory (Almeria, Spain)and at the Sierra Nevada Observatory (Granada, Spain). 294 points distributed over the binary period and covering both eclipses are given. The comparison stars used to calculate the differential light curves (SAO 15242 and SAO 15251) were confirmed as being good reference stars with constant flux. These observations are part of a 6 year uvby and Hβ monitoring program of low mass eclipsing binaries whose main objective is to provide accurate absolute astrophysical parameters for late-type main sequence stars. Details about the standardisation process and accuracy of the photometry are also given. The internal accuracy of the standard photometry measured as the mean RMS of the differences between standard and observed values for the standard stars observed along the program is only a few millimagnitudes. Detailed analysis of ZZ UMa, based on these light curves, will be published separately. Based on observations collected with the Spanish 1.5m telescope at Calar Alto, Almeria, Spain, and the Spanish 1m telescope at Sierra Nevada, Granada, Spain. Tables 2 and 3 will be accessible only in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr//Abstract.html

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