Optical and X-ray rebrightening in NS X-ray Nova Aql X-1
ATel #10541; A. Meshcheryakov (IKI, Moscow, Russia), I. Bikmaev, E. Irtuganov, N. Sakhibullin (KFU/AST, Kazan, Russia), V. V.Vlasyuk, O. I.Spiridonova (SAO, Nizhnij Arkhyz, Russia), I. Khamitov (TUG, Antalya, Turkey), P. Medvedev, M. N.Pavlinsky (IKI, Moscow, Russia), S. S.Tsygankov (Tuorla Observatory, Finland)
on 29 Jun 2017; 11:07 UT
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Subjects: Optical, X-ray, Neutron Star, Transient
The current outburst in NS X-ray Nova Aql X-1 has started ~ 28 May 2017, as it was reported earlier (see ATel#10441, #10450, #10452). During optical monitoring campaign of Aql X-1, performed at 1.5-m Russian-Turkish telescope (TUBITAK National Observatory) and 1-m SAO RAS optical telescope (Special Astrophysical Observatory) we report a substantial increase of optical brightness of Aql X-1 in the last few days.
|57901.94 ||28 May ||17.54 ||1-m SAO RAS |
|57902.92 ||29 May ||17.55 ||1-m SAO RAS |
|57926.90 || 22 Jun ||17.22 ||1-m SAO RAS |
|57926.97 ||22 Jun ||17.14 ||1.5-m RTT150 |
|57927.86 || 23 Jun ||17.18 ||1.5-m RTT150 |
|57927.90 || 23 Jun ||17.18 ||1-m SAO RAS |
|57928.96 || 24 Jun || 17.46 ||1.5-m RTT150 |
|57930.93 || 26 Jun ||16.70 ||1-m SAO RAS |
|57931.90 || 27 Jun ||16.88 ||1-m SAO RAS |
The statistical photometric errors are <1% and ~2% for 1.5-m RTT150 and 1-m SAO RAS, respectivelly.
We estimate absolute photometric calibration error as 3%.
Furthermore, during the last several days (time interval 57925 - 57932 MJD) the Swift BAT light curve of Aql X-1 also shows a factor ~2 continuous brightening (from 0.01 to 0.02 counts/sec/cm^2) in the hard X-rays 15-50keV (see https://swift.gsfc.nasa.gov/results/transients/AqlX-1/). Thus, both X-ray and Optical observations indicate enhancement of accretion activity in NS X-ray Nova Aql X-1.
We encourage further multi-wavelength observations of the source.