Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291l..47l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. L47-L50
Astronomy and Astrophysics
Astrophysics
21
Brown Dwarf Stars, Stellar Luminosity, Stellar Mass, Stellar Orbits, Triple Stars, Astronomical Photometry, Data Reduction, Speckle Interferometry, Stellar Magnitude
Scientific paper
As part of a survey for duplicity among nearby M dwarfs with the technique of near-infrared speckle imaging we detected two faint companions to the low-mass star LHS 1070. Apportioning the system brightness among the main component and the companions of this triple system, we obtain absolute brightnesses at 2.2 micrometers of KA=9.27 mag, KB=10.47 mag and KC=10.82 mag. Based on empirical mass-K magnitude relationship for M dwarfs (Henry & McCarthy 1993), a primary mass of mA=0.099 solar mass is estimated, while the masses of the companions should be close to or even slightly below the hydrogen burning limit of 0.08 solar masses. LHS 1070 has an important advantage over the few still fainter candidates for substellar masses: orbital motion within this triple system with its small component separations of a few astronomical units will allow useful dynamical mass determinations for the companions within the next few years. The observed changes in relative position of the components between July 1993 and April 1994 appear compatible with the photometrically deduced very low component masses.
Eckart Andreas
Leinert Ch.
Richichi Andrea
Tacconi-Garman Lowell Evan
Weitzel N.
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