The Substellar Population in IC 348

Details The Substellar Population in IC 348 The Substellar Population in IC 348

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003iaus..211..103l&link_type=abstract

Brown Dwarfs, Proceedings of IAU Symposium #211, held 20-24 May 2002 at University of Hawaii, Honolulu, Hawaii. Edited by Eduard

Astronomy and Astrophysics

Astronomy

Scientific paper

I present the latest results in a continuing effort to spectroscopically identify the substellar members of the young cluster IC 348. I have combined new images at I and Z with IR photometry from previous studies and from 2MASS and selected candidate members of the cluster across a larger area and at lower masses than probed in previous surveys. After observing these candidates with spectroscopy, the latest census for IC 348 contains 234 members with spectral types, 22 of which are later than M6 and thus are probably substellar. Individual masses of cluster members are estimated by combining their positions on the Hertzsprung-Russell (H-R) diagram with theoretical evolutionary models. From an extinction-limited sample of members (A_V<=4), I construct an IMF for IC 348 that should be complete down to 0.02 M&sun;. This IMF is compared to a similarly derived mass function for Taurus by Briceño et al. (2002); these data provide clear evidence for a variation of the IMF with star-forming conditions.

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