IGR J01217-7257

Other name = XTE J0119-731 (SXP2.16)

Type Orb. P /Spin P. Radio Counterpart Infrared/Optical Counterpart
R.A. (J2000) Dec. (J2000) References R.A. (J2000) Dec. (J2000) References
Likely Be-HMXB 84.03 d SMC732.03.3540 Coe et al. 2014 ATel 5806
01h 21m 40.6s -72° 57' 31"
Published Papers
Miscellaneous :
Coe et al. 2014ATel 5806 :
  • INTEGRAL discovery, follow-up with Swift, refinement of X-ray position
  • 14th magnitude star identified in OGLE IV as SMC732.03.3540
  • Large brightness changes of the order of one optical magnitude on timescales of 5-6 years
  • Clear outbursts every 84d identified as the binary period of the system.
  • Nearest catalogued Be/X-ray pulsar system is SXP2.16 detected by RXTE in 2003
  • RXTE Position formally inconsistent with that of from INTEGRAL but RXTE detection coincident with a previous optical flare and a general increased optical brightness of SMC732.03.3540
  • Swift did not detect pulsation => not possible to refute or confirm associations
  • Swift XRT image => position consistent with IBIS and the OGLE optical counterparts
  • IGR J01217-7257 is likely to be a new Be/X-ray binary system.
Schmidtke et al. 2014ATel 5889 :
  • 4 seasons of I-band photometry (XROM web site) examined
  • Refined long period of P=84.03 d obtained
  • Periodogram analysis also revealed optical pulsations at P=1.173 d with a full amplitude of ~0.02 mag
Haberl et al. 2015ATel 8305 :
  • XMM observations of the source during last outburst (october 2015)
  • Pulsations with a period of 2.16501 identical to those of XTE J0119-731 indicating IGR and XTE sources are the same
  • Refined X-ray positions confirm the B0-5III emission line star AzV 503 is the counterpart
  • X-ray spectral analysis=> absorbed power law + disk-blackbody model: Γ=0.42, kT=0.33, NH=4×1020 cm-2 (consistent with foreground absorption); inner-disk radius > 14.4 km

Last updated 23 Nov 2015

Jerome Rodriguez