2015A&A...582A..42K


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST15:29:22

2015A&A...582A..42K - Astronomy and Astrophysics, volume 582A, 42-42 (2015/10-1)

Accurate fundamental parameters and distance to a massive early-type eclipsing binary in the Danks 2 cluster.

KOURNIOTIS M., BONANOS A.Z., WILLIAMS S.J., CASTRO N., KOUMPIA E. and PRIETO J.L.

Abstract (from CDS):

We present a study of the properties of the O-type, massive eclipsing binary 2MASS J13130841-6239275 located in the outskirts of the Danks 2 cluster in the G305 star-forming complex, using near-infrared spectroscopy from VLT/ISAAC. We derive the masses and radii to be 24.5±0.9M and 9.2±0.1R for the primary and 21.7±0.8M and 8.7±0.1R for the secondary component. In addition, we evaluate the sensitivity of our parameters to the choice of the spectral features used to determine the radial velocities. Both components appear to be main-sequence O6.5-O7 type stars at an age of ∼5Myr, which is in agreement with the age of the cluster. A high visual extinction of A5495=11.9±0.1mag is reported, which is likely attributed to the cold molecular gas contaminating the northeast region of the cluster. By fitting the spectral energy distribution of the system to the available BVIcJHKs photometry, we determine a distance to the system of 3.52±0.08 kpc with a precision of 2%, which is the most well-determined distance to the Danks 2 cluster and the host complex reported in the literature.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - open clusters and associations: individual: Danks - stars: distances - stars: early-type - stars: massive

Status at CDS:  

Simbad objects: 5

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Number of rows : 5

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 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14612 1
2 Cl Danks 1 OpC 13 12 27 -62 42.1           ~ 57 0
3 Cl Danks 2 OpC 13 12 55 -62 40.9           ~ 53 0
4 NAME G305 Complex SFR 13 13 -62.7           ~ 50 0
5 2MASS J13130841-6239275 EB* 13 13 08.4051213899 -62 39 27.510058347           O 3 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-15:29:22

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