Abstract
PRECISE positions and optical identifications for the galactic X-ray sources 2A1822–371 (4U1822–37) and 2S1254–690 (4U1254–69), are presented here using the scanning modulation collimator (MC) on HEAO 1 (ref. 1). Briefly, the HEAO 1 MC instrument contains two independent four-grid collimator systems, one having planes of maximum transmission with 30 arc s. FWHM, and the other having 120 arc s FWHM, the overall field of view of each being limited to 4° × 4° FWHM. The planes of transmission of the modulation collimators are inclined at ± 10° to the scan direction, so that the lines of position from each have an included angle of 20°. Data are folded and binned around the catalogued positions2–4 of X-ray sources in the manner described by Gursky et al.1.
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GRIFFITHS, R., GURSKY, H., SCHWARTZ, D. et al. Positions and identifications for galactic X-ray sources 2A1822–371 and 2S1254–690. Nature 276, 247–249 (1978). https://doi.org/10.1038/276247a0
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DOI: https://doi.org/10.1038/276247a0
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