Abstract
WE have used the SAS-3 X-ray observatory to search for X rays from Nova Cygni 1975 before, during and after the time of optical maximum (1975 August 30–31). No X rays were detected at any time over the spectral range 0.1–50 keV, and from these negative results we can place very low upper limits on the ratio of X-ray to optical luminosity.
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HOFFMAN, J., LEWIN, W., BRECHER, K. et al. Search for X-ray emission from Nova Cygni 1975. Nature 261, 208–210 (1976). https://doi.org/10.1038/261208a0
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DOI: https://doi.org/10.1038/261208a0
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