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Article: A RAVE investigation on Galactic open clusters: II. Open cluster pairs, groups and complexes

TitleA RAVE investigation on Galactic open clusters: II. Open cluster pairs, groups and complexes
Authors
KeywordsOpen clusters and associations: general
Stars: kinematics and dynamics
Galaxy: kinematics and dynamics
Stars: abundances
Solar neighborhood
Issue Date2017
PublisherEDP Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy & Astrophysics, 2017, v. 600, article no. A106, p. 1-15 How to Cite?
AbstractContext. It is generally agreed upon that stars form in open clusters (OCs) and stellar associations, but little is known about structures in the Galactic OC population; whether OCs and stellar associations are born isolated or if they prefer to form in groups, for example. Answering this question provides new insight into star and cluster formation, along with a better understanding of Galactic structures. Aims. In the past decade, studies of OC groupings have either been based solely on spatial criteria or have also included tangential velocities for identifications. In contrast to previous approaches, we assumed that real OC groupings occupy a well defined area in the sky and show similar velocity vectors. For the first time, we have used 6D phase-space information, including radial velocities from the RAdial Velocity Experiment (RAVE) and other catalogues, for the detection of OC groupings. We also checked the age spread of potential candidates to distinguish between genuine groupings and chance alignments. Methods. We explored the Catalogue of Open Cluster Data (COCD) and determined 6D phase-space information for 432 out of 650 listed OCs and compact associations. The group identification was performed using an adapted version of the Friends-of-Friends algorithm, as used in cosmology, with linking lengths of 100 pc and 10–20 km s-1. For the verification of the identified structures, we applied Monte Carlo simulations with randomised samples. Results. For the linking lengths 100 pc and 10 km s-1 , we detected 19 groupings, including 14 pairs, 4 groups with 3−5 members, and 1 complex with 15 members. The Monte Carlo simulations revealed that, in particular, the complex is most likely genuine, whereas pairs are more likely chance alignments. A closer look at the age spread of the complex and the comparison between spatial distributions of young and old cluster populations suggested that OC groupings likely originated from a common molecular cloud.
Persistent Identifierhttp://hdl.handle.net/10722/241781
ISSN
2019 Impact Factor: 5.636
2015 SCImago Journal Rankings: 2.446
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorConrad, C-
dc.contributor.authorScholz, RD-
dc.contributor.authorKharchenko, NV-
dc.contributor.authorPiskunov, AE-
dc.contributor.authorRöser, S-
dc.contributor.authorSchilbach, E-
dc.contributor.authorde Jong, RS-
dc.contributor.authorSchnurr, O-
dc.contributor.authorSteinmetz, M-
dc.contributor.authorGrebel, EK-
dc.contributor.authorZwitter, T-
dc.contributor.authorBienaymé, O-
dc.contributor.authorBland-Hawthorn, J-
dc.contributor.authorGibson, BK-
dc.contributor.authorGilmore, G-
dc.contributor.authorKordopatis, G-
dc.contributor.authorKunder, A-
dc.contributor.authorNavarro, JF-
dc.contributor.authorParker, QA-
dc.contributor.authorReid, W-
dc.contributor.authorSeabroke, G-
dc.contributor.authorSiviero, A-
dc.contributor.authorWatson, F-
dc.contributor.authorWyse, R-
dc.date.accessioned2017-06-20T01:48:28Z-
dc.date.available2017-06-20T01:48:28Z-
dc.date.issued2017-
dc.identifier.citationAstronomy & Astrophysics, 2017, v. 600, article no. A106, p. 1-15-
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/10722/241781-
dc.description.abstractContext. It is generally agreed upon that stars form in open clusters (OCs) and stellar associations, but little is known about structures in the Galactic OC population; whether OCs and stellar associations are born isolated or if they prefer to form in groups, for example. Answering this question provides new insight into star and cluster formation, along with a better understanding of Galactic structures. Aims. In the past decade, studies of OC groupings have either been based solely on spatial criteria or have also included tangential velocities for identifications. In contrast to previous approaches, we assumed that real OC groupings occupy a well defined area in the sky and show similar velocity vectors. For the first time, we have used 6D phase-space information, including radial velocities from the RAdial Velocity Experiment (RAVE) and other catalogues, for the detection of OC groupings. We also checked the age spread of potential candidates to distinguish between genuine groupings and chance alignments. Methods. We explored the Catalogue of Open Cluster Data (COCD) and determined 6D phase-space information for 432 out of 650 listed OCs and compact associations. The group identification was performed using an adapted version of the Friends-of-Friends algorithm, as used in cosmology, with linking lengths of 100 pc and 10–20 km s-1. For the verification of the identified structures, we applied Monte Carlo simulations with randomised samples. Results. For the linking lengths 100 pc and 10 km s-1 , we detected 19 groupings, including 14 pairs, 4 groups with 3−5 members, and 1 complex with 15 members. The Monte Carlo simulations revealed that, in particular, the complex is most likely genuine, whereas pairs are more likely chance alignments. A closer look at the age spread of the complex and the comparison between spatial distributions of young and old cluster populations suggested that OC groupings likely originated from a common molecular cloud.-
dc.languageeng-
dc.publisherEDP Sciences. The Journal's web site is located at http://www.aanda.org-
dc.relation.ispartofAstronomy & Astrophysics-
dc.rightsReproduced with permission from Astronomy & Astrophysics, © ESO 2017. The original publication is available at https://doi.org/10.1051/0004-6361/201630012-
dc.subjectOpen clusters and associations: general-
dc.subjectStars: kinematics and dynamics-
dc.subjectGalaxy: kinematics and dynamics-
dc.subjectStars: abundances-
dc.subjectSolar neighborhood-
dc.titleA RAVE investigation on Galactic open clusters: II. Open cluster pairs, groups and complexes-
dc.typeArticle-
dc.identifier.emailParker, QA: quentinp@hku.hk-
dc.identifier.authorityParker, QA=rp02017-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1051/0004-6361/201630012-
dc.identifier.scopuseid_2-s2.0-85017314013-
dc.identifier.hkuros272592-
dc.identifier.volume600-
dc.identifier.spagearticle no. A106, p. 1-
dc.identifier.epagearticle no. A106, p. 15-
dc.identifier.isiWOS:000400754000108-
dc.publisher.placeFrance-

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