IGR J18214-1318

IGR J18214-1318

Other name = CXOU J182119.7-131838

Type	distance	Radio Counterpart			Infrared/Optical Counterpart
		R.A. (J2000)	Dec. (J2000)	References	R.A. (J2000)	Dec. (J2000)	References
HMXB probable O9 I companion	6-10 kpc				2MASS J18211975-1318388 DENIS J182119.7-131838 USNO-B1.0 0766-0475700		Tomsick et al. 2008
Published Papers		Tomsick et al. 2008, ApJ, 685, 1143 Rodriguez et al., 2009, A&A, 494, 417 Butler et al. 2009, ApJ, 698,502

Miscellaneous :

Tomsick et al. 2008 :

J=12.786, H=11.657, Ks=11.983 (2MASS), R=20.3, I=17.0 (USNO-B1.0)

Absorbed power law, N_H=11.7x10²² cm-2, Γ= 0.7, Unabs. 0.3-10 keV flux=60 e-12 erg/cm2/s

Favour an HMXB with local absorption although not possible to confirm since optical/IR counterpart is blended

Rodriguez et al. 2009 :

Swift XRT analysis => absorbed power law Γ=0.4 N_H=3.5 x10²² cm-2

Fixing N_H to the value of Tomsick et al. does not provide a good fit=> genuine variations of N_H

further confirmation of the HMXB nature

Butler et al. 2009 :

Optical spectroscopy

V=22.2, R=19.3 and I=16.2.

Source is an HMXB

Companion B0 V or a O9 I star favour of a supergiant HMXB, hence the latter

Last updated 12 March 2009