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| Miscellaneous :
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Hill et al. 2005 :
- NH~7 x 1022 cm-2
- orbital period 4.57 days
- pulsation at 139.47 s
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| Walter et al. 2006:
possible soft excess and marginal K-alpha line (EW ~ 33 eV)
NH = 9.1(+-0.5)x1022 at/cm2
IR counterpart (1.1 arcsec away) has a K-band magnitude of 11.4
unabsorbed flux (2-100 keV) is 1.1x10-10 ergs/cm2/s
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Masetti et al. 2008:
- Optical spectroscopy is presented and detailed
- Hαin emission
- R=16.9
- d~10 kpc
- Early BIII companion not a Sg (SEE HOWEVER CHATY ET AL. 2008)
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Chaty et al. 2008:
- Optical and infrared observations
- 1 additional bright source within XMM error box, and a fainter one
- 2MASS source is favoured due to closest position to the centre of
XMM error box, and NIR brightess
- J=12.81, H=11.95, Ks=11.50
- Hydrogen (α to ζ) and HeII emission lines in optical,
Paschen and Brackett series in IR, HeI and He II in IR
- Tentative P-Cygni profile in some lines
- NIR spectra typical of supergiant (SEE HOWEVER MASETTI ET AL. 2008).
- SED fitting => Tstar=20800 K typical of B sg. Likely
distance 11.9 kpc
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Torrejón et al. 2010 A&A:
- Optical spectroscopy
- Companion is a B1 Ib
- distance 12.4 kpc
- Typical Sg-HMXB
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Masson et al. 2011 A&A:
- NIR observations
- Refine spectral type to B0-1 I
- Mass comprised in the 18.6+/-0.8 -- 21.8 +/- 2.4 Msun
depending on the assumptions used.
- Estimates for the mass of the neutron star of 1.4 +/-2 -- 1.6 +/- 0.3 Msun
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Falanga et al. 2015 (A&A):
- Use of RXTE/ASM and INTEGRAL/ISGRI long term light curve to update ephemeris,
refine orbital period decay
- T0, ecl. = 52168.245 (MJD), POrb., ecl=4.5697, dot(P)/P=-21e-6/yr
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