V and Rc photometry of the candidate white dwarf pulsar ZTF J185139.81+171430.3
ATel #14973; Elena Pavlenko, Aleksei Sosnovskij (Crimean Astrophysical Observatory RAS)
on 15 Oct 2021; 13:07 UT
Credential Certification: Elena Pavlenko (eppavlenko@gmail.com)
Subjects: Optical, Binary, Cataclysmic Variable, Star, Variables, Pulsar
ZTF J185139.81+171430.3 (hereafter J1851) is a candidate white dwarf pulsar, as was suggested by Kato & Kojiguchi (2021). They found large-amplitude (~0.8 magnitude) coherent variations with a very short (0.00858995(3) d) period by using ZTF observations in the interval of BJD 2458646-2458746. Significant X-ray emission from this object was detected by Swift-XRT on August 15 and 29
(Klingler and Pavlov, ATel 14965).
We observed J1851 in primary focus of the Shajn 2.6-m telescope of the Crimean Astrophysical Observatory on August 6 in V and Rc bands. During of BJD 2459433.29230-2459433.40455, 58 brightness estimates were obtained in each band. We have registered a period of 0.00852(7) d, which, within the accuracy, coincides with the period found by Kato & Kojiguchi. The V and Rc data folded on the period of 0.00852 d are shown in Figure
. The mean amplitude in the Rc and V bands is 0.6 and 0.5 magnitude respectively.
