Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ans..conf..117p&link_type=abstract
In Max-Planck Inst. Phys. and Astrophys. Accreting Neutron Stars p 117-120 (SEE N83-15179 05-88)
Astronomy and Astrophysics
Astrophysics
Pulsars, Pulse Rate, X Ray Sources, Energy Spectra, Light Curve, Pulse Duration, Spectrum Analysis, Variability
Scientific paper
A number of measurements of the recurrent transient X-ray source A0535+26 were made during its outburst phase, since its detection in 1975 by Ariel 5. The optical counterpart of the source (Be Star 245770) was also extensively studied both in active and quiescent state in optical I2R2 and U2V2 bands. These data show a positive correlation with the X-ray flux. The X-ray flux from the source during the outburst increases to about twice the Crab intensity in soft X-ray band and gradually decreases to 100 mCrab during 30 to 50 days. However positive detection of the sources has not been reported until now during the low state. The spectral measurements of the source in the energy band 20-100 keV made during the low state in 1981 are presented.
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