Search for X-ray emission from Nova Cygni 1975

Astronomy and Astrophysics – Astronomy

Scientific paper

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Novae, X Ray Astronomy, X Ray Sources, Light Curve, Light Emission, Mass Transfer, Stellar Luminosity, Stellar Mass

Scientific paper

A search for X-rays from Nova Cygni 1975 was carried out before, during, and after the time of optical maximum. No X-rays were detected over the spectral range 0.1-50 keV. On the basis of these results a strong upper limit of .0001 has been placed on the ratio of X-ray to optical luminosity for this nova, consistent with effective temperatures of about 10,000 K. If Nova Cygni 1975 is a virgin nova, its low mass exchange rate would imply that any associated X-ray emission would not be detectable by present techniques.

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