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The complex X-ray spectrum of the low-mass X-ray binary 4U 1626-67 | | A. Owens
; T. Oosterbroek
; A. N. Parmar
; | | Date: |
3 Jun 1997 | | Subject: | astro-ph | | Affiliation: | ESA/ESTEC | | Abstract: | We report on observations of the X-ray pulsar 4U 1626-67 by the LECS instrument on-board Bepposax. We confirm the recent ASCA discovery of excess emission near 1 keV (Angelini et al. 1995). The pulse period of 7.66794 +/- 0.00004 s indicates that the source continues to spin-down. The phase averaged spectrum is well fit by an absorbed power-law of photon index 0.61 +/- 0.02 and a blackbody of temperature 0.33 +/- 0.02 keV, together with an emission feature at 1.05 +/- 0.02 keV. This spectral shape is similar to that observed by ASCA during the spin-down phase, but significantly different from measurements during spin-up. This suggests that the change in spectrum observed by ASCA may be a stable feature during spin-down intervals. The source intensity is a factor ~2 lower than observed by ASCA three years earlier, confirming that 4U 1626-67 continues to become fainter with time. | | Source: | arXiv, astro-ph/9706021 | | Services: | Forum | Review | PDF | Favorites | |
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