2012A&A...547A..30K


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.19CET23:58:44

2012A&A...547A..30K - Astronomy and Astrophysics, volume 547A, 30-30 (2012/11-1)

Fundamental parameters of four massive eclipsing binaries in Westerlund 1.

KOUMPIA E. and BONANOS A.Z.

Abstract (from CDS):

Only a small number of high mass stars (>30M) have fundamental parameters (i.e. masses and radii) measured with high enough accuracy from eclipsing binaries to constrain formation and evolutionary models of massive stars. This work aims to increase this limited sample, by studying the four massive eclipsing binary candidates discovered by Bonanos in the young massive cluster Westerlund 1. We present new follow-up echelle spectroscopy of these binaries and models of their light and radial velocity curves. We obtain fundamental parameters for the eight component stars, finding masses that span a range of 10-40M, and contributing accurate fundamental parameters for one additional very massive star, the 33M component of W13. WR77o is found to have a ∼40M companion, which provides a second dynamical constraint on the mass of the progenitor of the magnetar known in the cluster. We also use W13 to estimate the first, direct, eclipsing binary distance to Westerlund 1 and therefore the magnetar and find it to be at 3.7±0.6kpc. Our results confirm previous evidence for a high mass for the progenitor of the magnetar. In addition, the availability of eclipsing binaries with accurate parameters opens the way for direct, independent, high precision eclipsing binary distance measurements to Westerlund 1.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - binaries: eclipsing - open clusters and associations: individual: Westerlund 1 - stars: early-type - stars: Wolf-Rayet - stars: massive

CDS comments: Eclipsing binary W DEB is [B2007] J164658.78-455431.9 in Simbad.

Simbad objects: 12

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Number of rows : 12

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 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 269 0
2 WR 77aa WR* 16 46 46.2846645677 -45 47 58.263027602       15.516 13.063 WC9d 5 0
3 WR 77b WR* 16 46 59.90 -45 55 25.6       16.9 13.0 WC9d 8 0
4 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 454 0
5 Cl* Westerlund 1 W 36 * 16 47 05.0818815492 -45 50 55.159484121   22.8 18.89 16.09 13.38 ~ 7 0
6 WR 77o WR* 16 47 05.37 -45 51 04.7     20.99 17.50 14.37 WN7o 20 0
7 WR 77q WR* 16 47 06.01 -45 50 23.4       17.652 15.223 WN5o 10 0
8 Cl* Westerlund 1 W 13 EB* 16 47 06.4536718776 -45 50 26.067083031   21.1 17.19 14.63 12.06 BIa+ 27 0
9 WR 77s WR* 16 47 08.3531944202 -45 50 45.405753222     19.69 16.59 13.68 WN7b 20 0
10 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 172 1
11 [CPR2002] B17 s*b 20 30 27.3017352150 +41 13 25.127848580     13.053     O6Iaf+O9Ia 25 0
12 NAME Local Group GrG ~ ~           ~ 6801 0

    Equat.    Gal    SGal    Ecl

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2020.02.19-23:58:44

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