Multiplicity among Very-Low Mass Stars and Brown Dwarfs in Alpha Persei and the Pleiades

Details Multiplicity among Very-Low Mass Stars and Brown Dwarfs in Alpha Persei and the Pleiades Multiplicity among Very-Low Mass Stars and Brown Dwarfs in Alpha Persei and the Pleiades

Publishing date

Jul 2000

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8701m&link_type=abstract

Journals

HST Proposal ID #8701

Science

Computer Science

Additional info 3

Hst Proposal Id #8701 Cool Stars

Type

Scientific paper

Abstract

Open clusters provide excellent hunting grounds for brown dwarf {BD} searches. The AlphaPer and Pleiades clusters are young {80-120 Myr}, nearby {120-175 pc}, and have low extinction. They are cosidered to be the best-suited places to study the Substellar Mass Function {SMF}. A dozen of cool faint AlphaPer and Pleiades members have been confirmed as ``bona-fide'' BDs with the lithium test. By comparison with those, about 60 very good cluster BD candiates are currently known. The Pleiades SMF obtained using the most recent deep large CCD surveys indicates that BDs are quite numerous but do not make a significant contribution to the total cluster mass. One of the main uncertainties of the SMF is the effect of binary corrections. We propose a WFPC2 search for faint companions to very low-mass cluster stars and BDs. We will use any identified companions to provide empirical constraints on BD evolutionary models, to test our ideas about fragmentation in molecular clouds, and to correct the SMF. The sensitivity of WFPC2 shows that we can readily detect secondaries with masses of about 25 Jupiters orbiting at about 40 AU from our targets. Companions with masses of about 15 Jupiters can be detected at separations of 80 AU.

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