The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association

Rosaria Bonito, Vallenari, Lanzafame, Randich, Palla, Jeffries, Carraro, Alfaro, Gilmore, Bonito, Micela, Jiménez-Esteban, Klutsch, Costado, Jofré, Sacco, Bayo, Frasca, Jackson, Cottaar & 11 others Lardo, Damiani, Magrini, Spina, C. Allende Prieto, Mapelli, Barrado, Franciosini, Flaccomio, Sbordone, Morbidelli

Risultato della ricerca: Article

21 Citazioni (Scopus)

Abstract

The nearby (distance ∼ 350-400 pc), rich Vela OB2 association, includes γ2 Velorum, one of the most massive binaries in the solar neighbourhood and an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations have led to the discovery of two kinematically distinct populations in the young (10-15 Myr) cluster immediately surrounding γ2 Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35 Myr cluster located two degrees south of γ2 Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population that is kinematically distinct from and younger than NGC 2547. The radial velocities, lithium absorption lines, and the positions in a colour-magnitude diagram of this secondary population are consistent with those of one of the components discovered around γ2 Velorum. This result shows that there is a young, low-mass stellar population spread over at least several square degrees in the Vela OB2 association. This population could have originally been part of a cluster around γ2 Velorum that expanded after gas expulsion or formed in a less dense environment that is spread over the whole Vela OB2 region.
Lingua originaleEnglish
pagine (da-a)L7-
Numero di pagine5
RivistaASTRONOMY & ASTROPHYSICS
Volume574
Stato di pubblicazionePublished - 2015

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European Southern Observatory
lithium
radial velocity
pre-main sequence stars
solar neighborhood
expulsion
color-magnitude diagram
diagram
velocity distribution
young
gas
gases

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association. / Bonito, Rosaria; Vallenari; Lanzafame; Randich; Palla; Jeffries; Carraro; Alfaro; Gilmore; Bonito; Micela; Jiménez-Esteban; Klutsch; Costado; Jofré; Sacco; Bayo; Frasca; Jackson; Cottaar; Lardo; Damiani; Magrini; Spina; Prieto, C. Allende; Mapelli; Barrado; Franciosini; Flaccomio; Sbordone; Morbidelli.

In: ASTRONOMY & ASTROPHYSICS, Vol. 574, 2015, pag. L7-.

Risultato della ricerca: Article

Bonito, R, Vallenari, Lanzafame, Randich, Palla, Jeffries, Carraro, Alfaro, Gilmore, Bonito, Micela, Jiménez-Esteban, Klutsch, Costado, Jofré, Sacco, Bayo, Frasca, Jackson, Cottaar, Lardo, Damiani, Magrini, Spina, Prieto, CA, Mapelli, Barrado, Franciosini, Flaccomio, Sbordone & Morbidelli 2015, 'The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association', ASTRONOMY & ASTROPHYSICS, vol. 574, pagg. L7-.
Bonito, Rosaria ; Vallenari ; Lanzafame ; Randich ; Palla ; Jeffries ; Carraro ; Alfaro ; Gilmore ; Bonito ; Micela ; Jiménez-Esteban ; Klutsch ; Costado ; Jofré ; Sacco ; Bayo ; Frasca ; Jackson ; Cottaar ; Lardo ; Damiani ; Magrini ; Spina ; Prieto, C. Allende ; Mapelli ; Barrado ; Franciosini ; Flaccomio ; Sbordone ; Morbidelli. / The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association. In: ASTRONOMY & ASTROPHYSICS. 2015 ; Vol. 574. pagg. L7-.
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title = "The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association",
abstract = "The nearby (distance ∼ 350-400 pc), rich Vela OB2 association, includes γ2 Velorum, one of the most massive binaries in the solar neighbourhood and an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations have led to the discovery of two kinematically distinct populations in the young (10-15 Myr) cluster immediately surrounding γ2 Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35 Myr cluster located two degrees south of γ2 Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population that is kinematically distinct from and younger than NGC 2547. The radial velocities, lithium absorption lines, and the positions in a colour-magnitude diagram of this secondary population are consistent with those of one of the components discovered around γ2 Velorum. This result shows that there is a young, low-mass stellar population spread over at least several square degrees in the Vela OB2 association. This population could have originally been part of a cluster around γ2 Velorum that expanded after gas expulsion or formed in a less dense environment that is spread over the whole Vela OB2 region.",
keywords = "Open clusters and associations: Individual: NGC 2547; Open clusters and associations: Individual: Vela OB2; Stars: Formation; Stars: Individual: Gamma2 velorum; Stars: Pre-main sequence; Techniques: Spectroscopic; Astronomy and Astrophysics; Space and Planetary Science",
author = "Rosaria Bonito and Vallenari and Lanzafame and Randich and Palla and Jeffries and Carraro and Alfaro and Gilmore and Bonito and Micela and Jim{\'e}nez-Esteban and Klutsch and Costado and Jofr{\'e} and Sacco and Bayo and Frasca and Jackson and Cottaar and Lardo and Damiani and Magrini and Spina and Prieto, {C. Allende} and Mapelli and Barrado and Franciosini and Flaccomio and Sbordone and Morbidelli",
year = "2015",
language = "English",
volume = "574",
pages = "L7--",
journal = "Astronomy and Astrophysics",
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T1 - The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association

AU - Bonito, Rosaria

AU - Vallenari, null

AU - Lanzafame, null

AU - Randich, null

AU - Palla, null

AU - Jeffries, null

AU - Carraro, null

AU - Alfaro, null

AU - Gilmore, null

AU - Bonito, null

AU - Micela, null

AU - Jiménez-Esteban, null

AU - Klutsch, null

AU - Costado, null

AU - Jofré, null

AU - Sacco, null

AU - Bayo, null

AU - Frasca, null

AU - Jackson, null

AU - Cottaar, null

AU - Lardo, null

AU - Damiani, null

AU - Magrini, null

AU - Spina, null

AU - Prieto, C. Allende

AU - Mapelli, null

AU - Barrado, null

AU - Franciosini, null

AU - Flaccomio, null

AU - Sbordone, null

AU - Morbidelli, null

PY - 2015

Y1 - 2015

N2 - The nearby (distance ∼ 350-400 pc), rich Vela OB2 association, includes γ2 Velorum, one of the most massive binaries in the solar neighbourhood and an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations have led to the discovery of two kinematically distinct populations in the young (10-15 Myr) cluster immediately surrounding γ2 Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35 Myr cluster located two degrees south of γ2 Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population that is kinematically distinct from and younger than NGC 2547. The radial velocities, lithium absorption lines, and the positions in a colour-magnitude diagram of this secondary population are consistent with those of one of the components discovered around γ2 Velorum. This result shows that there is a young, low-mass stellar population spread over at least several square degrees in the Vela OB2 association. This population could have originally been part of a cluster around γ2 Velorum that expanded after gas expulsion or formed in a less dense environment that is spread over the whole Vela OB2 region.

AB - The nearby (distance ∼ 350-400 pc), rich Vela OB2 association, includes γ2 Velorum, one of the most massive binaries in the solar neighbourhood and an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations have led to the discovery of two kinematically distinct populations in the young (10-15 Myr) cluster immediately surrounding γ2 Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35 Myr cluster located two degrees south of γ2 Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population that is kinematically distinct from and younger than NGC 2547. The radial velocities, lithium absorption lines, and the positions in a colour-magnitude diagram of this secondary population are consistent with those of one of the components discovered around γ2 Velorum. This result shows that there is a young, low-mass stellar population spread over at least several square degrees in the Vela OB2 association. This population could have originally been part of a cluster around γ2 Velorum that expanded after gas expulsion or formed in a less dense environment that is spread over the whole Vela OB2 region.

KW - Open clusters and associations: Individual: NGC 2547; Open clusters and associations: Individual: Vela OB2; Stars: Formation; Stars: Individual: Gamma2 velorum; Stars: Pre-main sequence; Techniques: Spectroscopic; Astronomy and Astrophysics; Space and Pla

UR - http://hdl.handle.net/10447/224119

UR - http://www.edpsciences.org/journal/index.cfm?edpsname=aa

M3 - Article

VL - 574

SP - L7-

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

ER -