Nearby solar-type star with a low-mass companion - New sensitivity limits reached using speckle imaging

Details Nearby solar-type star with a low-mass companion - New sensitivity limits reached using speckle imaging Nearby solar-type star with a low-mass companion - New sensitivity limits reached using speckle imaging

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1369h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, April 1992, p. 1369-1373.

Astronomy and Astrophysics

Astronomy

13

Binary Stars, Dwarf Stars, G Stars, Speckle Interferometry, Stellar Orbits, Astronomical Photometry, Infrared Imagery, Stellar Mass

Scientific paper

The low-mass companion to the nearby solar-type star Gliese 67 is imaged using 2D IR speckle imaging techniques. The binary is resolved at J (1.25 micron), H (1.65 micron), and K (2.2 microns) to determine the magnitudes and colors of the components. In observations spanning 14 months the secondary is found at separations and position angles predicted by the astrometric orbit, and the component masses are found to be 0.97 and 0.29 solar mass. With a magnitude difference of 4.5 mag at K, these observations define a new sensitivity limit for companions at subarcsecond scales, 6-9 AU for the observations reported here of the Gliese 67 system. For the G dwarf/M dwarf pair, this brightness ratio corresponds to 7.5 mag at V, or a flux ratio of 1000. The data indicate that even greater sensitivity is possible, to companions six magnitudes fainter than their primaries in the infrared, thereby allowing us to search for very low-mass secondaries orbiting nearby solar-type stars.

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