Astron. Astrophys. Suppl. Ser.
Volume 132, Number 3, November I 1998
|Page(s)||367 - 379|
|Published online||15 November 1998|
Physical parameters of the Algol system TZ Eridani from simultaneous analysis of Geneva 7-colour light curves *,**
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.
Send offprint request to: F. Barblan
Accepted: 11 May 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
Based on observations made at the European Southern Observatory (La Silla, Chile) and at the Mount Laguna Observatory (U.S.A.)
Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsweb.u-strasbg.fr/Abstract.html
© European Southern Observatory (ESO), 1998