Accurate fundamental parameters and distance to a massive early-type eclipsing binary in the danks 2 cluster
| Autor: | Alceste Z. Bonanos, E. Koumpia, J. L. Prieto, Stephen J. Williams, M. Kourniotis, Norberto Castro |
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| Přispěvatelé: | Kapteyn Astronomical Institute, Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Binary number
FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Photometry (optics) Observatory 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Spectroscopy 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics binaries: eclipsing Astronomy and Astrophysics stars: early-type Astrophysics - Astrophysics of Galaxies Early type stars: massive Stars Secondary component Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) stars: distances Spectral energy distribution Astrophysics::Earth and Planetary Astrophysics open clusters and associations: individual: Danks |
| Zdroj: | Astronomy & Astrophysics Artículos CONICYT CONICYT Chile instacron:CONICYT Astronomy and astrophysics, 582:A42. EDP Sciences |
| ISSN: | 1432-0746 |
| Popis: | 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$\pm$0.9 M$_{\odot}$ and 9.2$\pm$0.1 R$_{\odot}$ for the primary and 21.7$\pm$0.8 M$_{\odot}$ and 8.7$\pm$0.1 R$_{\odot}$ 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 $\sim$5 Myr, which is in agreement with the age of the cluster. A high visual extinction of A$_{5495}$=11.9$\pm$0.1 mag is reported, which is likely attributed to the cold molecular gas contaminating the north-east region of the cluster. By fitting the spectral energy distribution of the system to the available $BVI_{c}JHK_{s}$ photometry, we determine a distance to the system of 3.52$\pm$0.08 kpc with a precision of 2$\%$, which is the most well-determined distance to the Danks 2 cluster and the host complex reported in the literature. 13 pages, 9 figures, 6 tables. Accepted for publication in A&A |
| Databáze: | OpenAIRE |
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