Abstract
The multiplicity properties of massive stars in 30 Doradus
Hugues Sana (Amsterdam University)
H. Sana, P. Dunstall, V. Henault-Brunet, P. Dufton, C. Evans, W. Taylor, A. de Koter, S. de Mink, N. Langer, and the Flames-Tarantula Consortium
The VLT FLAMES-Tarantula survey is an ESO Large Programme that has obtained multi-epoch spectroscopy of ~800 massive stars in the 30 Dor region, the largest homogeneous sample of its kind available to date. The prime scientific drivers for this survey were threefold: (i) testing the evolution theories for massive stars, (ii) providing a near-complete census of the closest proto-starburst, (iii) investigating the dynamics of the Tarantula region. A first and critical ingredient towards these goals was the issue of the multiplicity of the massive stars, that shaped the multi-epoch observational strategy of the Tarantula Survey.(to be confirmed by the SOC)We have identified over 100 O-type and about 250 B-type binaries, based on radial velocities and time variance analysis.We constrain the true binary fraction and estimate the most probable distribution of the orbital parameters using Monte Carlo simulations that quantify the observational biases.We will compare the multiplicity properties of the 30 Dor and the Galactic massive stars and we will discuss the implications in terms of massive star formation and binary evolution.