PC Astrometry of the Brown Dwarf Candidate PPL 15

Details PC Astrometry of the Brown Dwarf Candidate PPL 15 PC Astrometry of the Brown Dwarf Candidate PPL 15

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6726m&link_type=abstract

HST Proposal ID #6726

Physics

Hst Proposal Id #6726 Cool Stars

Scientific paper

We plan to obtain deep, far red PC images of the field around the brown dwarf candidate, PPl 15, in the Pleiades. This low-mass object is the only brown dwarf candidate to date to show Li I in its spectrum thus at least requiring a mass of < 0.1 Msun. Its radial velocity matches that of more massive stars in the Pleiades, but nothing is known of its proper motion which accounts for two of three velocity vectors. Its membership is probable but will remain uncertain until the proper motion is determined. In addition to determining the proper motion, we expect to determine its parallax which will fix its luminosity and definitively answer the question of membership. The PC frames will also be useful to search for any anomalies in the image structure of PPl 15.

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