|
|
| Miscellaneous :
|
|
Parisi et al. 2008 ATel 1710:
- Optical spectroscopy of candidates counterparts
of XMMLS1 J183049.6-123218
- Spectrum of USNO-A2.0 0750-13371563
(RA = 18 30 49.88, DEC = -12 32 18.7 with R ~ 17.0)
shows a red continuum, possibly absorbed by the Galactic dust
along the line of sight + several Balmer, HeI and HeII narrow
emission lines
- z ~0.
- EWHα~ 22 Angstrom.
- Spectrum resembles that of a CV
- Relative strength of the HeII emission line =>presence of a
magnetic white dwarf
- USNO-A2.0 0750-13371563 is the optical counterpart of IGR
J18308-1232, => Cataclysmic Variable, possibly magnetic
white dwarf
|
|
| Masetti et al. 2009:
d~320 pc
Av=0.67
|
|
| Butler et al. 2009:
Optical spectroscopy
Optical spectrum typical of either CVs or LMXBs, but X-ray spectrum is however too hard for LMXB
V=17.1, R=17.1, I=16.2
Distance d~220 pc
NH=0.31 x 1022 cm-2
|
|
| Tomsick et al. 2009:
Chandra observation
Chandra spectrum differs from XMM one
NH=0.4 x 1022 cm-2, Γ=0.54
|
|
Bernardini et al. 2012 (A&A):
- Multi-wavelengths observations
- Pulse and orbital periods = 1820s , 4.2 hr
- Broad band spectral analysis
- Disc overflow accretion mode
- MWD~0.85 Msun at d~100 pc
|
|
Thornstensen & Halpern 2013 (ApJ):
- Optical observations => V=17.95, B-V=+0.34 V-I= 1.171
- Results consistent with previous ones => slightly double peaked Hα emission line
- Periodicity (radial profile) at ~5.4 hr. If 1 cycle/d higher => 4.39 hr close to previous results
|
|