EDP Sciences
Free access
Volume 372, Number 2, June III 2001
Page(s) 588 - 593
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010532

A&A 372, 588-593 (2001)
DOI: 10.1051/0004-6361:20010532

uvby light curves of the eclipsing binary system V2154 Cyg

E. Rodríguez1, J. M. García2, S. Martín1 and A. Claret1

1  Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, 18080 Granada, Spain
2  Departamento de Física, E.U.I.T. Industriales, UPM, Ronda de Valencia 3, 28012 Madrid, Spain

(Received 29 September 2000 / Accepted 6 April 2001)

This paper presents complete uvby light curves for the recently discovered eclipsing binary system V2154 Cyg. Additional Crawford H$_{\beta}$ data were also obtained. Three times of primary minima and two secondary minima are determined. An improved orbital period is found to be 2$\fd$6306312. A detailed photometric analysis is made using the EBOP code. This eclipsing binary is probably one of the components of a much wider double star, forming altogether a triple system. The results show that the eclipsing pair is a detached system with two late-type stars very different in size. Masses of about $M_1=1.4 M_{\odot}$ and $M_2=0.8 M_{\odot}$ are inferred for the components by using stellar evolution models. The total mass of the probable triple system is estimated to be of about 3.5 $M_{\odot}$, leading to a minimum orbital period of about 140 yr for the visual pair.

Key words: stars: binaries: eclipsing -- stars: individual: V2154 Cyg -- stars: fundamental parameters -- techniques: photometric

Offprint request: E. Rodríguez, eloy@iaa.es

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