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IC 2602: A lithium depletion boundary age and new candidate low-mass stellar members

Dobbie, Paul; Lodieu, N; Sharp, Robert

Description

We report the results from a photometric and spectroscopic survey of ~1.4 deg2 of the young open cluster IC 2602. Fourteen objects have been identified as having magnitudes, spectral types and radial velocities consistent with being probable or possible low-mass stellar members of the cluster. We have used the observed location of the lithium depletion boundary in the sequence defined by these objects to place a new and improved constraint on the cluster age, τ= 46+6-5 Myr. This new...[Show more]

dc.contributor.authorDobbie, Paul
dc.contributor.authorLodieu, N
dc.contributor.authorSharp, Robert
dc.date.accessioned2015-12-13T22:45:07Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/79609
dc.description.abstractWe report the results from a photometric and spectroscopic survey of ~1.4 deg2 of the young open cluster IC 2602. Fourteen objects have been identified as having magnitudes, spectral types and radial velocities consistent with being probable or possible low-mass stellar members of the cluster. We have used the observed location of the lithium depletion boundary in the sequence defined by these objects to place a new and improved constraint on the cluster age, τ= 46+6-5 Myr. This new determination is larger by a factor ~1.3-1.8 than the majority of age estimates which have been obtained using the main-sequence turn-off or pre-main-sequence isochrone techniques. It is thus consistent with the trend indicated by the results of similar studies on other young open clusters. Based on this new age, we set a lower limit on the cluster mass function over the range M = 0.054 - 0.24 M⊙, dn/dM > 46 M-1⊙. If the mass function of IC 2602 has a form similar to that of other young clusters and associations then future wide, deep surveys can expect to unearth at least a handful of brown dwarfs which could potentially serve as benchmark objects.
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Brown dwarfs; Open clusters and associations: individual: IC 2602; Stars: low-mass; Techniques: photometric
dc.titleIC 2602: A lithium depletion boundary age and new candidate low-mass stellar members
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume409
dc.date.issued2010
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationf5625xPUB8014
local.type.statusPublished Version
local.contributor.affiliationDobbie, P, Australian Astronomical Observatory
local.contributor.affiliationLodieu, N, Instituto de Astrofísica de Canarias
local.contributor.affiliationSharp, Robert, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage1002
local.bibliographicCitation.lastpage1012
local.identifier.doi10.1111/j.1365-2966.2010.17355.x
dc.date.updated2016-02-24T09:39:08Z
local.identifier.scopusID2-s2.0-78649722698
CollectionsANU Research Publications

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