Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236l.131a&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 236, Mar. 15, 1980, p. L131-L135.
Astronomy and Astrophysics
Astronomy
14
Astronomical Spectroscopy, Binary Stars, Position (Location), Pulsars, Visual Observation, X Ray Sources, Astrometry, Black Holes (Astronomy), Companion Stars, Emission Spectra, Heao 1, Oao 3
Scientific paper
The region of the binary system V861 Scorpii, whose secondary has been suggested as a black hole candidate, was observed with the HEAO 1 X-ray observatory during an 8-hour pointed observation on September 4, 1978. An upper limit of 1.0 micro Jy (within three standard deviations) is placed on X-ray emission from V861 Sco during this observation. This effectively removes the secondary from the list of black hole candidates. The presence of a 38 sec pulsar in the region is confirmed, precise (0.63 sq arcmin) positions are given, and a search for the optical counterpart is described.
Armstrong Thomas J.
Bradt Hale V.
Cowley Anne Pyne
Doxsey Rodger Evans
Griffiths Richard E.
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