A&A Supplement series, Vol. 123, May II 1997, 1-4
Received June 3; accepted September 13, 1996
light curves of ZZ Ursae
Majoris
R. Clement
- M. García
- V. Reglero
- J.V. Clausen
- A. Bravo
- J. Suso
- J. Fabregat
- J.M. Torrejón
- P. Reig
- A. Marco
Send offprint request: R. Clement
Departamento de Astronomía y Astrofísica,
Universidad de Valencia, Dr. Moliner 50, E-46100 Burjassot,
Valencia, Spain
Departamento de Física Aplicada,
E.U.I.T. Industrial, Universidad Politécnica de Madrid,
Ronda de Valencia 3, E-28012 Madrid, Spain
The Niels Bohr Institute for Astronomy, Physics and
Geophysics, Astronomical Observatory,
Brorfeldevej 23, DK-4340, Töllöse, Denmark
This paper presents first complete uvby light curves of the
late-type detached eclipsing binary ZZ UMa (
,
).
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
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.
keywords: stars: binaries: eclipsing -- stars: late-type -- stars: individual: ZZ UMa -- stars: fundamental parameters