Astron. Astrophys. Suppl. Ser. 132, 367-379
F. Barblan 1 - P. Bartholdi 1 - P. North 2 - G. Burki 1 - E.C. Olson 3
Send offprint request: F. Barblan
1 - Geneva Observatory, CH-1290 Sauverny, Switzerland
2 - Institut d'Astronomie de l'Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland
3 - Astronomy Department, University of Illinois, 1002 W. Green St., Urbana, Illinois 61801, U.S.A.
Received March 27; accepted May 11, 1998
Light curves of the semi-detached eclipsing binary system TZ Eridani in the Geneva 7-colour photometric system were analysed using the Wilson-Devinney programme. The physical and orbital parameters have been determined through a self-consistent simultaneous solution of the seven light curves and of the radial velocity curves of both components. The following absolute elements of the components are, for the primary (mass gainer), , 0.03 , , K, and for the secondary (mass loser), , , , 100 K. The semi-major axis A of the relative orbit is 0.16 . The regular increase of the period is described. The spectral type of the components are A5/6 V (primary) and K0/1 III. The secondary has exhibited a long-term luminosity increase of about 0.06 in V between Dec. 1983 and Dec. 1996. The distance to TZ Eri is evaluated to 270 12 pc.
Key words: stars: individual: TZ Eridani -- binaries: eclipsing -- stars: fundamental parameters
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