2001A&A...369..561F


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST04:52:08

2001A&A...369..561F - Astronomy and Astrophysics, volume 369, 561-573 (2001/4-2)

On the eclipsing nature of CPD -59 2628.

FREYHAMMER L.M., CLAUSEN J.V., ARENTOFT T. and STERKEN C.

Abstract (from CDS):

The spectroscopic binary CPD-59°2628 (Sp=O9.5V) 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 P=1.47d which is consistent with the spectroscopy-binary period by Solivella & Niemela (1999RMxAC...8..145S). We use this period to rematch the misidentified radial velocities from Levato et al. (1991ApJS...75..869L) 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 2.6±0.1kpc and it has a systemic velocity of -19km/s, confirming its membership in the cluster Trumpler 16 (radial velocity -23.5km/s). The temperatures are 32000K for the hotter star (A) and 30000K for the cooler (B). We determine the absolute dimensions (solar units): MA=14.0±2.0, RA=5.29±0.26, MB=11.7±1.8 and RB=4.38±0.22. By adopting E(b-y)=0.306, we get Mbol,A=-6.3±0.1, MV,A=-3.2±0.1, Mbol,B=-5.6±0.1 and MV,B=-2.7±0.1. Theoretical stellar models from Claret (1995), including convective-core overshooting and mass loss for a composition (X=0.70, Z=0.02), appear to fit the components at an age of ∼2 Myr.

Abstract Copyright:

Journal keyword(s): stars: individual: CPD -59°2628 - stars: binaries: spectroscopic - stars: binaries: eclipsing - stars: distances - stars: early-type

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 258691 * 06 30 33.3081907645 +04 41 27.531212864 9.78 10.27 9.70     O9V 28 0
2 V* V578 Mon EB* 06 32 00.6080933581 +04 52 40.879145861 8.01 8.72 8.55 8.09 8.28 B0V+B1V 94 0
3 V* PT Pup bC* 07 36 41.0358985359 -19 42 08.425242012 4.65 5.524 5.699     B2II 134 0
4 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2209 0
5 HD 303308 ** 10 45 05.9146041531 -59 40 05.922859453 7.45 8.30 8.17 7.92 7.75 O4.5V((fc)) 279 0
6 CPD-59 2627 * 10 45 06.7193450422 -59 41 56.559181565 9.606 10.343 10.116   9.685 O9.5V 45 0
7 CPD-59 2628 Al* 10 45 08.2247688925 -59 40 49.412517288 8.791 9.571 9.460 9.87 9.219 O9.5V(n)+B0.5V(n) 69 0
8 Cl Trumpler 16 OpC 10 45 10 -59 43.0   5.35 5.0     ~ 428 0
9 CPD-59 2632 SB* 10 45 11.1817712486 -59 41 11.200891694 10.207 10.943 10.797   10.494 B1V 33 0
10 * 11 Sgr Or* 18 09 17.7002679002 -23 59 18.232366605 6.65 7.45 7.31 8.36   O7V(n)z+B0:V: 126 2

    Equat.    Gal    SGal    Ecl

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2020.08.09-04:52:08

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