2003ApJ...587..754J -
Astrophys. J., 587, 754-760 (2003/April-3)
X-ray spectroscopy of the accreting millisecond pulsar XTE J0929-314 in outburst.
JUETT A.M., GALLOWAY D.K. and CHAKRABARTY D.
Abstract (from CDS):
We present the high-resolution spectrum of the accretion-powered millisecond pulsar XTE J0929-314 during its 2002 outburst, measured using the Low Energy Transmission Grating Spectrometer on board the Chandra X-Ray Observatory. The 1.5-25.3 Å (0.5-8.3 keV) Chandra spectrum is well fitted by a power-law+blackbody model with photon index Γ=1.55±0.03, blackbody temperature kTbb=0.65±0.03 keV, and blackbody normalization Rbb,km/d10kpc=7.6±0.8. No emission or absorption features are found in the high-resolution spectrum, with a 3 σ equivalent width upper limit of less than 0.007 Å at 1.5 Å and less than 0.12 Å at 24 Å. The neutral absorption edge depths are consistent with the estimated interstellar absorption along the line of sight to the source. We found no orbital modulation of the 2-10 keV X-ray flux, to a 3 σ upper limit of 1.1%, which implies an upper limit on the binary inclination angle of i≲85° for a Roche lobe-filling companion. We also present the broadband spectrum measured over the course of the outburst by the Rossi X-Ray Timing Explorer (RXTE). The RXTE spectrum of XTE J0929-314 is also well fitted with a power-law+blackbody model, with average values of Γ=1.76±0.03, kTbb=0.66±0.06 keV, and Rbb,km/d10kpc=5.9±1.3 in the 2-50 keV energy range. The blackbody flux remained constant over the course of the outburst, while the power-law flux was strongly correlated to the (decreasing) flux of the source. We find that the difference in power-law photon indices measured from Chandra and RXTE spectra can be explained by a change in the power-law photon index at low energies.
Abstract Copyright:
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Journal keyword(s):
Stars: Pulsars: Individual: Alphanumeric: XTE J0929-314 - Stars: Neutron - X-Rays: Bursts - X-Rays: Stars
Simbad objects:
3
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