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Optical identification of IGR J19140+0951

J. J. M. in 't Zand·P. G. Jonker·G. Nelemans·D. Steeghs·K. O'Brien
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Abstract

IGR J19140+0951 was discovered by INTEGRAL in 2003 in the 4-100 keV band. Observations with INTEGRAL and RXTE provide a tentative identification as a high-mass X-ray binary (HMXB) with a neutron star as accretor. However, an optical counterpart was thus far not established, nor was the presence of a pulsar which is commonly observed in HMXBs. We observed IGR J19140+0951 with Chandra and find the source to be active at a similar flux as previous measurements. The lightcurve shows a marginally significant oscillation at 6.5 ks which requires confirmation. We determine a sub-arcsecond position from the Chandra data and identify the heavily reddened optical counterpart 2MASS 19140422+0952577 in the 2MASS catalog. Optical follow-up observations with the William Herschel Telescope at La Palma exhibit a continuum spectrum coming out of extinction above 7000 Angstrom without strong absorption or emission features. V, I and Ks band photometry point to an optical counterpart extincted by A[V]=11+/-2. The extinction is consistent with the interstellar value. None of the data reject the suspicion that IGR J19140+0951 is an HMXB with additional circumstellar obscuration around the accretor.

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J. J. M. in 't Zand, P. G. Jonker, G. Nelemans, D. Steeghs, K. O'Brien. 2005-11-24. Optical identification of IGR J19140+0951. https://doi.org/10.1051/0004-6361%3A20053411

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