Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205p..39j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Oct. 1983, p. 39P-41P. Research supported by the S
Astronomy and Astrophysics
Astronomy
19
Companion Stars, Dwarf Stars, Stellar Spectrophotometry, Astrometry, Stellar Mass
Scientific paper
Observations of 64-64-arcsec and 65 x 65-arcsec regions around 21 nearby stars, obtained with UKIRT and AAT, respectively, in March and June, 1981, are reported. The survey was undertaken to search for 'black dwarf' (0.001-0.08-solar-mass, 0.1-solar radius) companion objects. The limiting K magnitudes for the telescopes were about 14.5 and 15.0, and all objects detected were measured at J, H, and K to calculate approximate temperatures and radii. Black-dwarf candidates were defined as objects with temperatures less than about 2500 K and radii about 0.2 solar radius, but no such objects were found. It is pointed out that the design of the search favors detection of companions with a relatively large separation from the primary star; hence the result indicates that there are few or no black-dwarf companions beyond about 10 arcsec from nearby stars.
Giles Barry A.
Jameson Richard F.
Sherrington M. R.
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