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Unusual quiescent X-ray activity from XTE J0421+560 (CI Cam) | A.N. Parmar
; T. Belloni
; M. Orlandini
; D. Dal Fiume
; A. Orr
; N. Masetti
; | Date: |
30 May 2000 | Subject: | astro-ph | Affiliation: | ESA/ESTEC, Obs Brera, ITESRE/Bologna | Abstract: | We report on BeppoSAX observations of the X-ray transient XTE J0421+560 in quiescence 156, 541, and ~690 days after the maximum of the 1998 April outburst. In the first observation the source was soft with a power-law photon index of 4.0 (+1.9 -0.9) and absorption, NH, of (1.1 +4.9 -1.1) X 10^21 atom/cm2. In the second observation, the source brightened by a factor ~15 in the 1-10 keV energy range, became significantly harder with a photon index of 1.86 (+0.27 -0.32) and was strongly absorbed with NH = (4.0 +/- 0.8) X 10^23 atom/cm2. There is evidence for a narrow emission line in both spectra at ~7 keV. In the third observation, the source had faded by a factor ~$8 from the previous observation to below the BeppoSAX detection level. It is possible that these variations result from orbital motion of a compact object around the B[e] star companion with the intense, absorbed, spectrum arising during passage through dense circumstellar material. If this is the case, the system may be continuing to exhibit periodic activity. | Source: | arXiv, astro-ph/0005565 | Services: | Forum | Review | PDF | Favorites |
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