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Optical identification of a hard X-ray source IGR J18151-1052

ATel #2193; Burenin R. (IKI), Makarov D. (SAO RAS), Uklein R. (SAO RAS), Revnivtsev M. (IKI, Excellence Cluster Universe), Lutovinov A. (IKI)
on 9 Sep 2009; 09:16 UT
Credential Certification: Rodion Burenin (rodion@hea.iki.rssi.ru)

Subjects: Optical, X-ray, Gamma Ray, Binary

The optical counterpart of a new INTEGRAL hard X-ray source IGR J18151-1052 (Krivonos, et al., ATEL #2170) was observed with the 6-m BTA telescope (SAO RAS, Nizhnij Arkhyz, Russia) on August 24th, 2009. The only one relatively faint (I=~18.7) object was found in the XRT error box. The object is located at RA,Dec= 18 15 03.83 -10 51 35.0 (J2000, coordinates are given relative to USNOB1.0), 2.6 arcsec from the XRT position. Its 1000s spectrum was obtained with the SCORPIO spectrometer in a long slit mode with a spectral resolution 10 A in the range of 3500-7200 Angstroms. H_alpha emission line at zero redshift was detected in the spectrum, which is a direct indication that the object is an X-ray binary system inside our Galaxy. The optical continuum is consistent with that of an absorbed OB-star. The faint optical magnitude and indications on the intrinsic absorption in X-rays (Krivonos, et al., ATEL #2170) suggests that the system is a high-mass X-ray binary.