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Astron. Astrophys. 361, L49-L52 (2000)

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Letter to the Editor

RXJ 0529.4+0041: a low-mass pre-main sequence eclipsing-spectroscopic binary *

E. Covino 1, S. Catalano 2, A. Frasca 2, E. Marilli 2, M. Fernández 3, J.M.  Alcalá 1, C. Melo 4, R. Paladino 1, M.F. Sterzik 5 and B. Stelzer 6

1 Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
2 Osservatorio Astrofisico di Catania, Via S. Sofia, 78, Città Universitaria, 95125, Catania, Italy
3 Instituto de Astrofisica de Andalucia, Apdo. 3004, 18080 Granada, Spain
4 Observatoire de Genève, 51 ch. des Mailletes, 1290 Sauverny, Switzerland
5 European Southern Observatory, Casilla 190001, Santiago 19, Chile
6 Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany

Received 28 July 2000 / Accepted 7 September 2000


We report the discovery of a low-mass pre-main sequence eclipsing system among a sample of double-lined spectroscopic binaries found recently on the basis of ROSAT follow-up observations in the Orion star forming region.

From the analysis of the available photometric and spectroscopic data, we derive orbital elements as well as fundamental stellar parameters for the individual components of the eclipsing PMS binary RXJ 0529.4+0041. These results provide a new observational test for theoretical PMS evolutionary models setting some useful constraints on currently available PMS tracks and isochrones.

Key words: stars: distances – stars: evolution – stars: fundamental parameters – stars: Hertzsprung – Russel (HR) and C-M diagrams – stars: pre-main sequence

* Based on observations carried out with the 2.2m telescope of Calar Alto Observatory (Spain), the Swiss Euler telescope (La Silla-Chile), the 0.9m telescope of Serra La Nave (Catania, Italy)

Send offprint requests to: E. Covino (covino@na.astro.it)

© European Southern Observatory (ESO) 2000

Online publication: October 10, 2000