Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..568s&link_type=abstract
Nature, vol. 297, June 17, 1982, p. 568-570.
Other
103
B Stars, Binary Stars, Neutron Stars, Periodic Variations, Stellar Spectrophotometry, X Ray Sources, Magellanic Clouds, Pulsars, Stellar Envelopes, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Spectra, X Ray Spectra
Scientific paper
The detection of X ray pulsations with a period of 69.2126 ms from A0538-66 was done from the Einstein Observatory. A point source was located by the High Resolution Imager and a proportional counter registered a flux of 40 counts/sec over background. A column spectral density of 2 x 10 to the 23/sq cm identified the object as A0538-66. A persistent periodicity of 0.0692126 sec was observed throughout the event. The outbursts were not detected on three other observations of A0538-66, and a best fit to a change of rotation velocity indicated that the period observed was from a binary star with a Doppler shifted signal. The two stars are separated by less than 39 solar radii, with the larger star having a 40 solar radius. Consideration is given to the possibility that the X rays are due to accretion on a neutron star and that the two stars at times share a common envelope.
Bedford David K.
Elsner Ronald F.
Grindlay Jonathan
Leahy Denis
Skinner Gerald K.
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