Mathematics – Probability
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7894h&link_type=abstract
HST Proposal ID #7894
Mathematics
Probability
Hst Proposal Id #7894 Cool Stars Low-Mass Stars
Scientific paper
We continue our survey of stars within 10 parsecs for brown dwarf and very low mass stellar {VLM} companions. The nearby star population is dominated by the red dwarfs {75%}, which contribute 40% of the stellar mass to the disk and cause the luminosity function to climb all the way to the terminus of the stellar main sequence {Henry and McCarthy 1990}. But what happens to the LF past the end of the main sequence, in the realm of brown dwarfs? With a 10sigma detection limit of M_J 22 at 10 pc, our survey can reveal companions between 0.5" and 10" that are 11 mag fainter than the empirical end of the main sequence {M_J = 11}, and 6.5 mag fainter than the brown dwarf Gl 229B {M_J = 15.5}. This search will therefore be the largest, most sensitive, volume-limited search for VLM companions ever undertaken. In addition to the increased probability of finding brown dwarfs, this program provides fundamental ``spinoff'' science, including an improved determination of the LF for the nearby stars and characterization of all companions with separations 10-100 AU, similar to the scale of our solar system.
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