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Here we report the infrared identification of the X-ray source 2XMMJ191043.4+091629.4, which was detected by XMM-Newton/EPIC in the vicinity ofthe Galactic supernova remnant W49B. The aim of this work is to establish thenature of the X-ray source 2XMM J191043.4+091629.4 studying both the infraredphotometry and spectroscopy of the companion. We analyse UKIDSS images aroundthe best position of the X-ray source, and obtain spectra of the best candidateusing NICS in the 3.5 m TNG telescope. We present both photometric andspectroscopic TNG analysis of the infrared counterpart of the X-ray sourceidentifying emission lines in the K-band. H-band spectra does not present anysignificant feature. We have showed that Brackett gamma H I, at 2.165micrometre, and He I, at 2.184 micrometre and at 2.058 micrometre, are presentsignificantly in the infrared spectrum. The CO bands are also not present inour spectrum. Based on these results and the X-ray characteristics of thesource we conclude that the infrared counterpart is an early B-type supergiantstar with an E(B-V)= 7.6 +/- 0.3 at a distance of 16.0 +/- 0.5 kpc. This wouldbe, therefore, the first high-mass X-ray binary in the Outer Arm at galacticlongitudes between 30 and 60 degrees.

Infrared identification of 2XMM J191043.4+091629.4