Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6050l&link_type=abstract
HST Proposal ID #6050
Other
Hst Proposal Id #6050 Cool Stars
Scientific paper
Recently we detected and resolved in the near-infrared two faint components to the nearby low mass star LHS 1070. With their absolute K magnitudes of K_B = 10.4 mag and K_C = 10.8 mag these companions are expected to have masses very close to the hydrogen burning limit of 0.08 M_sun. Since the system is at a distance of only 7.5 pc from the sun, dynamical masses can be determined, and the very low mass companions still are bright enough for detailed study. Thus they provide an excellent if not unique opportunity to better determine the poorly covered transition region from low mass stars to substellar masses. We propose to do so by photometry with the WFPC2 and by spectroscopy with the FOS of all three components of LHS 1070. We want -- to check for substellar masses by searching for the Li 670.8 nm absorption, -- to determine luminosities by photometry and by integrating over spectra, -- to determine effective temperatures from VO and CaH bands, and -- to estimate metallicity and age from Na lines and other spectral features. This should also help to better understand other known very faint objects for which information on mass is not available.
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