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Full spectroscopic orbital solutions for more than 100 massive binaries in the high-mass starburst region 30 Doradus

Grant number: 13/18245-0
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): February 01, 2014
Effective date (End): January 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Astronomy
Principal Investigator:Augusto Damineli Neto
Grantee:Leonardo Andrade de Almeida
Supervisor abroad: Hugues Sana
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo, SP, Brazil
Local de pesquisa : Space Telescope Science Institute (STScI), United States  
Associated to the scholarship:12/09716-6 - Accurate distances to young clusters through massive eclipsing binaries, BP.PD

Abstract

A key ingredient missing from current formation and evolution theories of massive stars, and of cluster evolution, is a robust binary fraction and the intrinsic distributions of orbital parameters. The VLT-FLAMES Tarantula Survey (VFTS), which targeted 800 O- and B- stars in 30 Dor, was designed to detect most massive binaries with periods <200 d: the observed O-type binary fraction is 35% (126 binaries). Using a radial velocity monitoring, we will now characterise the orbits of these systems, with the aim of obtaining the first measurements of the period, mass-ratio and eccentricity distributions of massive binaries in a dense and dynamically complex environment, in which conditions are closer to those in super-star-clusters observed beyond the Local Group. We will also constrain the orbital properties of the 18 identified B-supergiant binaries, including an interacting and a post-interaction system. These systems represent key benchmark cases for models of close binary evolution. (AU)

Articles published in Agência FAPESP about the scholarship:
Astronomers find evidence of a planet with a mass almost 13 times that of Jupiter 
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