Identifying IGR J18293-1213 and IGR J14091-6108 as magnetic CVs
Abstract
The 'Unidentified INTEGRAL sources' legacy program conducted by NuSTAR aims at conclusively identifying 18 persistent hard X-ray sources detected by INTEGRAL in the Galactic plane. These individual identifications will help to characterize the corresponding population of faint hard X-ray sources in the Galaxy by improving the completeness of the current sample. IGR J18293-1213 and IGR J14091-6108 were observed in 2015 with NuSTAR & Swift/XRT and with NuSTAR, XMM-Newton, VLT & SOAR, respectively. The spectral and variability analyses we performed led to the successful identification of these two sources as magnetic Cataclysmic Variables and provided strong constraints on the corresponding systems. In particular, IGR J18293-1213 is an Intermediate Polar with a white dwarf mass of about 0.8 solar mass. The eclipse detected in the NuSTAR light curve provided sufficient information to fully characterize the orbital parameters of this first binary system. The X-ray spectrum of IGR J14091-6108 is much harder, suggesting that the white dwarf is more massive than those currently known and it reveals to be close to the Chandrasekhar limit, based on fits using the IP Mass model of Suleimanov et al. (2005). The optical spectrum and the timing analysis also provided an estimation of a distance and a spin period for this second source. I will present our analyses and the detailed parameters we obtained.
- Publication:
-
41st COSPAR Scientific Assembly
- Pub Date:
- July 2016
- Bibcode:
- 2016cosp...41E.365C