2001ApJ...552..738C -
Astrophys. J., 552, 738-747 (2001/May-2)
Discovery of a cyclotron resonant scattering feature in the rossi X-ray timing explorer spectrum of 4U 0352+309 (X Persei).
COBURN W., HEINDL W.A., GRUBER D.E., ROTHSCHILD R.E., STAUBERT R., WILMS J. and KREYKENBOHM I.
Abstract (from CDS):
We have discovered a ∼29 keV cyclotron resonance scattering feature (CRSF) in the X-ray spectrum of 4U 0352+309 (X Per) using observations taken with the Rossi X-Ray Timing Explorer. The source 4U 0352+309 is a persistent low-luminosity (LX=4.2x1034 ergs.s–1) X-ray pulsar with a 837 s period, which accretes material from the Be star X Per. The X-ray spectrum, unusual when compared to brighter accreting pulsars, may be due to the low mass accretion rate and could be typical of the new class of persistent low-luminosity Be/X-ray binary pulsars. We attempted spectral fits with continuum models used historically for 4U 0352+309 and found that all were improved by the addition of a CRSF at ∼29 keV. The model that best fitted the observations is a combination of a 1.45±0.02 keV blackbody with a 5.4x108 cm2 area and a power law with a 1.83±0.03 photon index modified by the CRSF. In these fits the CRSF energy is 28.6+1.5–1.7 keV, implying a magnetic field strength of 2.5(1+z)x1012 G in the scattering region (where z is the gravitational redshift). Phase-resolved analysis shows that the blackbody and cyclotron line energies are consistent with being constant through the pulse.
Abstract Copyright:
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Journal keyword(s):
stars: individual (4U 0352+309, X Persei) - Stars: Magnetic Fields - Stars: Neutron - X-Rays: Stars
Simbad objects:
9
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