The luminosity dependence of the phase-averaged X-ray spectrum of the transient 42 second pulsar EXO 2030+375

Details The luminosity dependence of the phase-averaged X-ray spectrum of the transient 42 second pulsar EXO 2030+375 The luminosity dependence of the phase-averaged X-ray spectrum of the transient 42 second pulsar EXO 2030+375

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13...12p&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)-355-(12)360

Astronomy and Astrophysics

Astronomy

4

Cyclotron Resonance, Pulsars, Stellar Luminosity, Stellar Magnetic Fields, Stellar Models, X Ray Astronomy, X Ray Spectra, Curve Fitting, Exosat Satellite, Ginga Satellite, Goodness Of Fit, Proportional Counters

Scientific paper

We report on the evolution in the X-ray spectrum of the transient X-ray pulsar EXO 2030+375 during part of an outburst in 1985 May-August. The overall continuum spectral shape is similar to that of other accreting pulsars and can be represented by a power-law spectrum modified at low energies by significant absorption and at high-energies either by an exponential cut-off or by the effects of cyclotron scattering. As the luminosity decreased by a factor of approximately 100, the X-ray spectrum became harder with the photon index decreasing from 1.83 +/- 0.01 to 1.29 +/- 0.01. In addition, the high-energy cutoff decreased from 20 to 10 keV during the same interval. If the cutoff is interpreted in terms of cyclotron resonance scattering, then this implies a magnetic field strength that decreased from 2.6 x 1012 G to 1.3 x 1012 G. This variation implies that the cutoff energy does not provide a reliable measure of the surface magnetic field strength in this system.

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