Physical parameters of the Algol system TZ Eridani from simultaneous analysis of Geneva 7-colour light curves
Abstract
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), M1 = 1.97 +- 0.06 Msol, R1 = 1.69 +- 0.03 Rsol, Mbol1 = 2.36 +- 0.09, Teff1 = 7770 +- 100 K, and for the secondary (mass loser), M2 = 0.37 +- 0.01 Msol, R2 = 2.60 +- 0.04 Rsol, Mbol2 = 3.74 +- 0.13, Teff2 = 4570 +- 100 K. The semi-major axis A of the relative orbit is 10.57 +- 0.16 Rsol. 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.
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