Astronomy and Astrophysics, volume 508, 889-894 (2009/12-3)
The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations.
RODRIGUEZ J., TOMSICK J.A., BODAGHEE A., ZURITA HERAS J.-A., CHATY S., PAIZIS A. and CORBEL S.
Abstract (from CDS):
We report the results of a high-energy multi-instrumental campaign with INTEGRAL, RXTE, and Swift of the recently discovered INTEGRAL source IGR J19294+1816. The Swift/XRT data allow us to refine the position of the source to RAJ2000=19:29:55.9 DecJ2000=+18:18"38.4 (±3.5"), which in turn permits us to identify a candidate infrared counterpart. The Swift and RXTE spectra are well fitted with absorbed power laws with hard (Γ∼1) photon indices. During the longest Swift observation, we obtained evidence of absorption in true excess to the Galactic value, which may indicate some intrinsic absorption in this source. We detected a strong (P=40%) pulsation at 12.43781 (±0.00003)s that we interpret as the spin period of a pulsar. All these results, coupled with the possible 117 day orbital period, point to IGR J19294+1816 being an HMXB with a Be companion star. However, while the long-term INTEGRAL/IBIS/ISGRI 18-40 keV light curve shows that the source spends most of its time in an undetectable state, we detect occurrences of short (∼2000-3000s) and intense flares that are more typical of supergiant fast X-ray transients. We therefore cannot make firm conclusions on the type of system, and we discuss the possible implications of IGR J19294+1816 being an SFXT.
X-rays: binaries - accretion, accretion disks - stars: individual: IGR J19294+1816 - stars: individual: IGR J11215-5952 - stars: individual: IGR J18483-0311
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