The complex X-ray spectrum of the low-mass X-ray binary 4U 1626-67
| dc.creator | Owens, A. | |
| dc.creator | Oosterbroek, T. | |
| dc.creator | Parmar, A. N. | |
| dc.date | 1997-06-03 | |
| dc.date.accessioned | 2026-07-25T12:58:09Z | |
| dc.description | 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. | |
| dc.description | 4 Latex pages. Accepted for publication in A&A (Letters) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9706021 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9706021 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/13325 | |
| dc.subject | Astrophysics | |
| dc.title | The complex X-ray spectrum of the low-mass X-ray binary 4U 1626-67 | |
| dc.type | text |