Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204l..67b&link_type=abstract
Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 2, p. L67-L71.
Astronomy and Astrophysics
Astrophysics
59
Circular Orbits, Light Curve, Novae, X Ray Sources, Binary Stars, Companion Stars, Energy Spectra, Orbit Calculation, Pulsed Radiation
Scientific paper
Eighteen X-ray light curves of the 104-sec periodicity in the Taurus X-ray nova A 0535+26 are analyzed which were obtained by SAS-3 in six energy intervals between 1 and 35 keV during the period from May 30 to June 2, 1975. It is shown that the pulse structure is relatively simple at energies above 19 keV, but develops a complex series of five irregularly spaced maxima at lower energies. The energy spectrum averaged over the 104-sec period is found to be extremely hard, with a best-fit temperature of about 30 keV for the exponential spectrum, an excess at about 15 keV, and a steepening above 20 keV. It is suggested that A 0535+26 may be a compact object in a binary system containing the peculiar Be star HDE 245770. The transient behavior could arise due to episodic mass loss by the primary or because the compact object is in a highly eccentric orbit about the companion, with appreciable mass transfer occurring only at periastron.
Bradt Hale
Buff James
Clark George W.
Doxsey Rodger
Hearn D.
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