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| Miscellaneous :
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Masetti et al. 2010:
- Optical spectroscopy of 1 RXS source
- Balmer emission lines, and Helium emission lines
- CV
- He II(4686)/Hβ >~ 0.5 (EW) => very likely a magnetic CV/IP
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Lutovinov et al. 2010:
- Give the "IGR J" name
- Swift, INTEGRAL, and BTA optical telescope observations
- Optical spectrum => strong hydrogen and helium lines in emission, typical of the SED of
a disk-accreting white dwarf,=> source is CV
- Coherent pulsations in optical light curve P~549 s attributed to the spin of the white dwarf
- System is intermediate polar CV
- Spectral analysis of X-ray data => partially-absorbed bremsstrahlung kT~21 keV,
with NH ~ 8 x 1022 cm-2, covering fraction of ~0.94
- Mass of the white dwarf ~ 0.85(15) M_sol
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Scaringi et al. 2011:
- Optical photometry and time-resolved spectroscopy
- Optical photometry => modulations at 546s (=spin period) and 3.7h (orbital
period)
- Time-resolved spec => Hα radial velocity shift modulated on orbital period
- As all other hard X-ray emitting IP, spin P < 30 min, and Spin to orbital ratio
(=0.04) < 0.1
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