作者
RD Jeffries, RJ Jackson, Michiel Cottaar, SE Koposov, AC Lanzafame, Michael R Meyer, Loredana Prisinzano, Sofia Randich, GIUSEPPE GERMANO Sacco, Elisa Brugaletta, M Caramazza, Francesco Damiani, Elena Franciosini, Antonio Frasca, G Gilmore, Sofia Feltzing, Giuseppina Micela, E Alfaro, Thomas Bensby, ELENA Pancino, A Recio-Blanco, P De Laverny, J Lewis, LAURA Magrini, LORENZO Morbidelli, M Teresa Costado, P Jofré, A Klutsch, K Lind, E Maiorca
发表日期
2014/3/1
期刊
Astronomy & Astrophysics
卷号
563
页码范围
A94
出版商
EDP Sciences
简介
Context
A key science goal of the Gaia-ESO survey (GES) at the VLT is to use the kinematics of low-mass stars in young clusters and star forming regions to probe their dynamical histories and how they populate the field as they become unbound. The clustering of low-mass stars around the massive Wolf-Rayet binary system γ2 Velorum was one of the first GES targets.
Aims
We empirically determine the radial velocity precision of GES data, construct a kinematically unbiased sample of cluster members and characterise their dynamical state.
Methods
Targets were selected from colour–magnitude diagrams and intermediate resolution spectroscopy was used to derive radial velocities and assess membership from the strength of the Li i 6708 Å line. The radial velocity distribution was analysed using a maximum likelihood technique that accounts for unresolved binaries.
Results
The GES radial velocity precision is about …
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RD Jeffries, RJ Jackson, M Cottaar, SE Koposov… - Astronomy & Astrophysics, 2014