Free access article

A&A 374, 980-996 (2001)
DOI: 10.1051/0004-6361:20010772

Absolute dimensions of solar-type eclipsing binaries.

I. light curves for HS Aqr, KX Aqr, AL Ari, V963 Cen, MR Del, NY Hya, DU Leo, UW LMi, and V358 Pup

J. V. Clausen, B. E. Helt and E. H. Olsen

Niels Bohr Institute for Astronomy, Physics, and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark

(Received 12 April 2001 / Accepted 22 May 2001 )

Abstract
We present complete uvby light curves of 9 recently discovered eclipsing binaries having late F, G, and K type components within or near the main-sequence band. They are the first results from a long term program carried out since 1994 at the Strömgren Automatic Telescope at ESO, La Silla. The aim is to provide the accurate absolute dimensions for solar-type stars needed for critical tests of the corresponding theoretical models. A serious dilemma appears to be present in the comparison of predictions from current stellar models with fundamental properties of known eclipsing binaries (Popper 1997b, Clausen et al. 1999b). Spectroscopic observations of the 9 eclipsing binaries are either available or are being obtained, and detailed analyses of the individual systems will be published in a series of subsequent papers. The light curves were obtained as part of a systematic search for new eclipsing systems among a large sample of (mostly) spectroscopic binaries. Catalogues of the extensive uvby and photometry from this search will be published separately.

Key words: stars: fundamental parameters -- stars: binaries: close -- stars: binaries: eclipsing -- stars: evolution -- stars: late type -- techniques: photometric

Offprint request: J. V. Clausen, jvc@astro.ku.dk

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