Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444l.101g&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 444, no. 2, p. L101-L104
Astronomy and Astrophysics
Astrophysics
17
Binary Stars, Brown Dwarf Stars, Companion Stars, Images, Stellar Magnitude, Stellar Mass, Stellar Orbits, Astronomical Photometry, Coronagraphs, Image Analysis, Image Processing
Scientific paper
Optical coronagraph images of the high proper motion astrometric binary Gl 105A reveal a very red companion, Gl 105C, located 3.27 arcsecs from Gl 105A at P.A. 287 deg. At this location, it is not clear whether Gl 105C can fully account for the astrometric perturbation of Gl 105A. Aperture photometry gives IC = 12.6 and RC - IC = 3.7 for Gl 105C, indicating that it is a very low mass M dwarf. Using the observed IC, an empirical MI versus I-K relation, and an assumed distance of 8.2 pc to Gl 105A, MK = 9.7 is derived for Gl 105C. An empirical mass-MK relation for low-mass stars suggest a mass of 0.084 solar mass for Gl 105C, which is just above the minimum mass for stable hydrogen burning. Gl 105C was not detected in previous K-band searches; its detection demonstrates the usefulness of optical coronagraphy for identifying very low mass objects.
Golimowski David A.
Kulkarni Sanjeev R.
Nakajima Tatsuya
Oppenheimer Ben R.
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