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

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

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.409.1002d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 409, Issue 3, pp. 1002-1012.

Astronomy and Astrophysics

Astronomy

4

Techniques: Photometric, Brown Dwarfs, Stars: Low-Mass, Open Clusters And Associations: Individual: Ic 2602

Scientific paper

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 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&sun;, dn/dM > 46 M-1&sun;. 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. Based on observations made with Anglo-Australian Telescope at Siding Spring Observatory, Australia.

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