Neutral Fe in an Eclipsing Low-Mass X-ray Binary 2S 0921-630
Abstract
2S 0921-630 is an eclipsing low-mass X-ray binary (LMXB) with an orbital period of ~ 9 days. X-ray observations have been shown that 2S 0921-630 has an accretion disk corona (ADC), from which most of the X-ray is emitted. In this presentation, we report Suzaku observations of 2S 0921-630. The time- integrated X-ray spectrum is reproduced with a blackbody emission (kT ∼ 0.3 keV) Comptonized by thermal electrons (kT\smalel ∼ 2 keV) and emission lines. We find that most of the emission lines correspond to highly ionized atoms in the ADC: O, Ne, Mg, Si, S, and Fe. On the other hand, broadened Fe K line (∼ 80 eV = 4000 km/s) and possible Fe K edge are also found. These are evidences of cold matter surrounding the system. We discuss the geometry of the neutral Fe with regard to the accretion disk wind and reflection from the outer region of the accretion disk.
- Publication:
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44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.1778Y