Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976newsc..69..494p&link_type=abstract
New Scientist, vol. 69, Mar. 4, 1976, p. 494-496.
Astronomy and Astrophysics
Astronomy
Novae, Stellar Evolution, X Ray Astronomy, X Ray Sources, X Ray Stars, Ariel Satellites, Black Holes (Astronomy), Neutron Stars, Sky Surveys (Astronomy), X Ray Spectra
Scientific paper
The discovery and life history of the transient X-ray source Mon X-1 are discussed. The source was detected on Aug. 3, 1974 by the sideways-looking Leicester Sky Survey Instrument aboard the British astronomical satellite Ariel-V. By August 13 Mon X-1 had become almost four times brighter than Sco X-1. The X-ray spectrum resembled that of Cygnus X-1, and periodic variations in the X-ray signal were absent. The X-ray spectrum was initially hard, with a mean source temperature of about 300 million K. The subsequent rapid increase in intensity was accompanied by marked softening of the spectrum to an effective source temperature at peak brightness of 20 million K. The X-ray intensity continued to decrease to 8 million K in mid-January, indicating the possible decay of an accretion disk. It is probable that Mon X-1 differs from the classical nova in that its secondary is a neutron star or black hole rather than a white dwarf.
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