Volume 448, Number 3, March IV 2006
|Page(s)||1101 - 1106|
|Section||Stellar structure and evolution|
|Published online||03 March 2006|
Optical identification of IGR J19140+0951
SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands e-mail: email@example.com
2 Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands
3 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02198, Massachusetts, USA
4 Dept. of Astrophysics, Radboud University, PO Box 9010, 6500 GL Nijmegen, The Netherlands
5 European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile
Accepted: 2 November 2005
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 Å without strong absorption or emission features. and Ks band photometry point to an optical counterpart with an extinction of . 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.
Key words: X-rays: binaries / X-rays: individuals: EXO 1912+098, IGR J19140+0951, 2MASS 19140422+0952577
© ESO, 2006
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