Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1062r&link_type=abstract
Astronomical Journal, vol. 85, Aug. 1980, p. 1062-1070.
Astronomy and Astrophysics
Astronomy
32
Astrometry, Collimators, Heao 1, X Ray Sources, Lunar Occultation, Magellanic Clouds, Tables (Data)
Scientific paper
Observations made with the HEAO-1 scanning modulation collimator are used to determine the positions of 16 unidentified X-ray sources at low galactic latitudes. Positions were obtained to within 10-30 arcsec in one dimension from two four-grid collimator observations made at six-month intervals. Positions determined in addition for eight sources identified with optical objects verify the method employed. Of the unidentified sources, the positional uncertainties of ten are reduced by factors of two to eight, the precise X-ray positions (within 10 arcsec) obtained by lunar occultation experiments are confirmed for three and multiple precise positions (within 20 arcsec) which reduce the previous location uncertainties by factors of greater than 100 are obtained for the remaining three.
Bradt Hale V.
Doxsey Rodger Evans
Griffiths Richard E.
Johnston Matthew D.
Reid C. A.
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