Volume 369, Number 2, April II 2001
|Page(s)||561 - 573|
|Section||Interstellar and circumstellar matter|
|Published online||15 April 2001|
On the eclipsing nature of *
University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
2 Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
3 Niels Bohr Institute for Astronomy, Physics and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
Corresponding author: L. M. Freyhammer, email@example.com
Accepted: 24 January 2001
The spectroscopic binary CPD -59°2628 (Sp = O9.5 V) has been discovered to be a detached eclipsing binary, and we present an analysis based on new light curves, published spectroscopy and two new high-resolution spectra. uvby light curves from more than 2000 observations are analysed with the WINK and the Wilson-Devinney (WD) programs. Geometric distortions and photometric effects from the proximity of the components are included in the computations. The detached system has a close circular orbit of high inclination and high maximum projected velocities. We find a photometric period which is consistent with the spectroscopy-binary period by Solivella & Niemela ([CITE]). We use this period to rematch the misidentified radial velocities from Levato et al. ([CITE]) and apply them in an analysis using the method of Lehmann-Filhes. We find that CPD -59°2628 is a young system close to the ZAMS. Its distance is kpc and it has a systemic velocity of -19 km s-1, confirming its membership in the cluster Trumpler 16 (radial velocity -23.5 km s-1). The temperatures are 32 000 K for the hotter star (A) and 30 000 K for the cooler (B). We determine the absolute dimensions (solar units): , , and . By adopting , we get , , and . Theoretical stellar models from Claret ([CITE]), including convective-core overshooting and mass loss for a composition (, ), appear to fit the components at an age of ~2 Myr.
Key words: stars: individual: CPD -59°2628 / stars: binaries: spectroscopic / stars: binaries: eclipsing / stars: distances / stars: early-type
© ESO, 2001
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