IGR J01054-7253

Other name = (?)

Type Orb. Per/Spin Per. Radio Counterpart Infrared/Optical Counterpart
R.A. (J2000) Dec. (J2000) References R.A. (J2000) Dec. (J2000) References
HMXB, O9.5/B0 IV-V 36.70 d/ 11.48143s [M2002] SMC 59977 Coe et al. 2009 ATel 2088
Published Papers
Miscellaneous :

Bozzo et al. 2009 ATel 2079:
  • INTEGRAL discovery => source is compatible with being in the SMC
  • IBIS/ISGRI spectrum => power law Γ=2.5
  • Rosat source in error box not counterpart unless IGR strongly variable
Coe et al. 2009 ATel 2088:
  • Swift observations
  • [M2002] SMC 59977 a V=14.8 star could be the counterpart
  • Star variable in I typical of Be in SMC
  • Periodicity at 17.49 s
  • HMXB in SMC
Corbet et al. 2009 ATel 2092:
  • RXTE observations => pulse at 11.483s and harmonics
  • Pulse profile complex with multiple peaks
Townsend et al. 2009 ATel 2202:
  • Doppler modulation of the 11.48s pulse period and a spin-up of this modulation.
  • Orbital period = 36.3 days
  • Average spin-up rate = 4.7 E-10 s/s.
  • Orbit is eccentric with e~0.28
  • Results => source lying in the Be region of the Corbet diagram
Masetti et al. 2010(A&A):
  • Optical spectroscopy of the counterpart
  • R=14.81, Av ~ 0.7
  • Balmer emission lines at z=0, intrinsically blue spectrum => XRB
  • d=60 kpc (SMC)
  • Early type star spectral appearance => HMXB
Townsend et al. 2010(MNRAS):
  • X-ray/Optical/IR analysis
  • Optical/IR observations =>orbital period =36.70 days
  • Spectral class constrained to O9.5-B0 luminosity class of IV-V rather than III as previously proposed
  • Distance to the source ~71 kpc
  • RXTE => Orb. period consistent with that of IR/Optical, semi-major axis of 167 lt-s, and eccentricity of 0.28(3)
  • Spin period=11.48143 s , spin-up rate of -4.67e-10 s/s, satisfying theoretical relation between luminosity, spin period, and spin-period derivative
  • Absorbed cutoff power law fits combined RXTE/XMM spectra with NH=2.3x1021 cm-2, Γ=1.06, Ecut=9 keV, and Efold=22 keV.

Last updated 23 august 2010

Jerome Rodriguez