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

Επιστημονική δημοσίευση - Άρθρο Περιοδικού uoadl:3069791 12 Αναγνώσεις

Μονάδα:
Ερευνητικό υλικό ΕΚΠΑ
Τίτλος:
Accurate fundamental parameters and distance to a massive early-type eclipsing binary in the Danks 2 cluster
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
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 ± 0.9 M⊙ and 9.2 ± 0.1 R⊙ for the primary and 21.7 ± 0.8 M⊙ and 8.7 ± 0.1 R⊙ 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 ~5 Myr, which is in agreement with the age of the cluster. A high visual extinction of A5495 = 11.9 ± 0.1 mag 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. © ESO, 2015.
Έτος δημοσίευσης:
2015
Συγγραφείς:
Kourniotis, M.
Bonanos, A.Z.
Williams, S.J.
Castro, N.
Koumpia, E.
Prieto, J.L.
Περιοδικό:
Chinese Astronomy and Astrophysics
Εκδότης:
EDP Sciences
Τόμος:
582
Λέξεις-κλειδιά:
Bins; Infrared devices; Near infrared spectroscopy, Binaries:eclipsing; Open clusters and associations:individual; Stars: distances; Stars: early-type; Stars: massive, Stars
Επίσημο URL (Εκδότης):
DOI:
10.1051/0004-6361/201526739
Το ψηφιακό υλικό του τεκμηρίου δεν είναι διαθέσιμο.