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The Gaia-ESO Survey...
The Gaia-ESO Survey: Kinematic structure in the Gamma Velorum cluster
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Jeffries, R. D. (author)
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Jackson, R. J. (author)
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Cottaar, M. (author)
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Koposov, S. E. (author)
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Lanzafame, A. C. (author)
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Meyer, M. R. (author)
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Prisinzano, L. (author)
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Randich, S. (author)
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Sacco, G. G. (author)
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Brugaletta, E. (author)
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Caramazza, M. (author)
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Damiani, F. (author)
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Franciosini, E. (author)
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Frasca, A. (author)
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Gilmore, G. (author)
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- Feltzing, Sofia (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Micela, G. (author)
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Alfaro, E. (author)
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- Bensby, Thomas (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Pancino, E. (author)
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Recio-Blanco, A. (author)
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De laverny, P. (author)
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Lewis, J. (author)
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Magrini, L. (author)
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Morbidelli, L. (author)
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Costado, M. T. (author)
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Jofre, P. (author)
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Klutsch, A. (author)
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Lind, K. (author)
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Maiorca, E. (author)
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(creator_code:org_t)
- 2014-03-14
- 2014
- English.
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In: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 563
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
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- 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 gamma(2) 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 angstrom 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 0.25 km s(-1) and sufficient to resolve velocity structure in the low-mass population around gamma(2) Vel. The structure is well fitted by two kinematic components with roughly equal numbers of stars; the first has an intrinsic dispersion of 0.34 +/- 0.16 km s(-1), consistent with virial equilibrium. The second has a broader dispersion of 1.60 +/- 0.37 km s(-1) and is offset from the first by congruent to 2 kms(-1). The first population is older by 1-2 Myr based on a greater level of Li depletion seen among its M-type stars and is probably more centrally concentrated around gamma(2) Vel. Conclusions. We consider several formation scenarios, concluding that the two kinematic components are a bound remnant of the original, denser cluster that formed gamma(2) Vel, and a dispersed population from the wider Vela OB2 association, of which gamma(2) Vel is the most massive member. The apparent youth of gamma(2) Vel compared to the older (>= 10 Myr) low-mass population surrounding it suggests a scenario in which the massive binary formed in a clustered environment after the formation of the bulk of the low-mass stars.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: pre-main sequence
- stars: kinematics and dynamics
- open clusters
- and associations: individual: gamma2 Velorum
- stars: formation
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Jeffries, R. D.
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Jackson, R. J.
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Cottaar, M.
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Koposov, S. E.
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Lanzafame, A. C.
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Meyer, M. R.
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show more...
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Prisinzano, L.
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Randich, S.
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Sacco, G. G.
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Brugaletta, E.
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Caramazza, M.
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Damiani, F.
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Franciosini, E.
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Frasca, A.
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Gilmore, G.
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Feltzing, Sofia
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Micela, G.
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Alfaro, E.
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Bensby, Thomas
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Pancino, E.
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Recio-Blanco, A.
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De laverny, P.
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Lewis, J.
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Magrini, L.
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Morbidelli, L.
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Costado, M. T.
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Jofre, P.
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Klutsch, A.
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Lind, K.
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Maiorca, E.
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