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| Miscellaneous :
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Grebenev et al. 2005 Atel 457:- Are PSR J1649-4349 and IGR
J16493-4348 associated?
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Markwardt et al. 2005 Atel 465:
- RXTE spectra highly absorbed NH~1023 cm-2
- Γ = 1.4
- No line in spectral fits, no pulsations.
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Kuiper et al. 2005 Atel 654:
- J,H and Ks magnitudes of 14.59, 12.86 and 11.94 respectively from 2MASS
- Ks=12.0 with NTT/Sofi => IR counterpart not extremely variable.
- No optical counterpart seen => strong absorption; heavily absorbed XRB
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Hill et al. (2008, NRAS):
- Refined X-ray position => not PSR J1649-4349
- Spitzer counterpart
- M3.6μ=11.25, M4.5μ=11.01, M5.8μ=10.9, M8.0μ=10.86
- Companion either close dwarf star, or far early star
- Spectral and temporal analysis => XRB
- More likely a HMXB, although LMXB not completely ruled out
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Nespoli et al. (2008):
ATel 1396
- K-band spectroscopy of 2MASS J16492695-4349090
- No metal lines detected.
- Detection of He I both in emission and absorption, and Brγ in absorption.
- Spectral type is B0.5 Ib.
- System is a neutron star (sg)HMXB.
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Morris et al. 2009:
- Suzaku observations
- The source is an heavily absorbed HMXB, with NH=26 x 1022 partially
covering the source with cov fraction of 62%
- Γ=2.37
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Nespoli et al. 2010 : (A&A)
- Details of observations that led them to classify the source as
a B0.5-1 Ia-Ib object => IGR a supergiant HMXB.
- Strong He I emission (at 20581 Angstrom)
strong He I absorption (21126A) and strong Br_gamma (21661A) in absorption
- Absorption on the line of sight ~ Nh~2.9 10^22 cm-2
- Excess absorbing matter is local to the X-ray source
- Range of distance to the source between 6 and 26 kpc.
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Corbet et al. 2010 ATel 2599
:
- Highly significant pulsation in RXTE/PCA 2-10 keV Swift/BAT
light curves at a period ~6.8d.
- Sine wave fits lead to:
Tmax (BAT) = MJD 54 301.39 + n x 6.7906
Tmax (PCA) = MJD 54,301.55 + n x 6.7851
- Period typical of orbital period for an HMXB with a Sg companion.
- Significant second pulse in both lcs at around 20.07-20.09 d. Discuss possible
nature (other XRB in the field, superorbital modulation,..)
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Cusumano et al. 2010 (MNRAS)
:
- Significant periodicity in Swift/BAT at 6.782 d.
- Identification of an eclipse in the folded light curve at T(MJD)=54175.92 +- n*P
- Semi-major orbital axis a~55 Rsun~ 2 Rstar with a maximum eccentricity 0.15.
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Corbet et al. 2010 ATel 2766
:
- Highly significant modulation at 1069±7 s
- Amplitude of the modulation ~ 20%.
- Value consistent with the range of periods seen in other sgHMXBs
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D'Ai et al. 2011 A&A:
- Swift and Suzaku observations
- Spectral fits => presence of a large absorption feature
- Feature has ~10 keV width and centroid E~30-33 keV; interpreted as a resonant cyclotron
absorption feature.
- Estimate a surface magnetic field of ~ 3.7 e12 G.
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