The Gaia-ESO survey: Dynamical analysis of the L1688 region in Ophiuchus
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Archivos
Fecha
2016-04
Profesor/a Guía
Facultad/escuela
Idioma
en
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Título del volumen
Editor
EDP Sciences
Nombre de Curso
Licencia CC
Licencia CC
Resumen
The Gaia ESO Public Spectroscopic Survey (GES) is providing the astronomical community with high-precision measurements of
many stellar parameters including radial velocities (RVs) of stars belonging to several young clusters and star-forming regions. One of
the main goals of the young cluster observations is to study their dynamical evolution and provide insight into their future, revealing
whether they will eventually disperse to populate the field rather than evolve into bound open clusters. In this paper we report the
analysis of the dynamical state of L1688 in the ρ Ophiuchi molecular cloud using the dataset provided by the GES consortium. We
performed the membership selection of the more than 300 objects observed. Using the presence of the lithium absorption and the
location in the Hertzspung-Russell diagram, we identify 45 already known members and two new association members. We provide
accurate RVs for all 47 confirmed members. A dynamical analysis, after accounting for unresolved binaries and errors, shows that the
stellar surface population of L1688 has a velocity dispersion σ ∼ 1.14 ± 0.35 km s−1
that is consistent with being in virial equilibrium
and is bound with a ∼80% probability. We also find a velocity gradient in the stellar surface population of ∼1.0 km s−1 pc−1
in the
northwest-southeast direction, which is consistent with that found for the pre-stellar dense cores, and we discuss the possibility of
sequential and triggered star formation in L1688.
Notas
Indexación: Scopus.
Palabras clave
Stars: Pre-main Sequence, Open Clusters and Associations: Individual: L1688, Stars: Kinematics and Dynamics, Stars: Formation
Citación
Astronomy and Astrophysics. Volume 588. 1 April 2016. Article number A123
DOI
10.1051/0004-6361/201527253