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, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.