1999MNRAS.302..700R -
Mon. Not. R. Astron. Soc., 302, 700-706 (1999/February-1)
X-ray spectral properties of the pulsar EXO 2030+375 during an outburst.
REIG P. and COE M.J.
Abstract (from CDS):
We present the results of the spectral analysis carried out of the X-ray pulsar EXO 2030+375. The observations were made using the Rossi X-ray Timing Explorer (RXTE) satellite. Our study concentrates on the X-ray characteristics of this source at lower luminosities (Lx < 5x1036 erg.s–1) than have previously been observed and in the energy range 2.7–30 keV. The PCA X-ray continuum spectra can be represented by a model containing two components: a power law with an exponential cut-off at higher energies and a blackbody. The power-law component accounts for the high-energy part of the continuum whereas the blackbody component describes the part of the spectrum below ∼ 10 keV. The radius of the X-ray emission surface is found to be ∼ 1 km, which agrees with the size of the neutron star polar caps. Our results are compared with higher-luminosity studies and are seen to agree with trends observed in these previous findings. We also show the first hard X-ray spectrum (17–65 keV) of EXO 2030+375. A possible spectral feature at ∼ 36 keV is tentatively ascribed to a cyclotron absorption line.
Abstract Copyright:
1999, Royal Astronomical Society
Journal keyword(s):
binaries: general - stars: emission - pulsars: individual: EXO 2030+375 - infrared: stars - X-rays: stars
Simbad objects:
1
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