UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAK SCI004000 Astronomy
BISAK SCI005000 Physics / Astrophysics
OGLE-BLG-DN-0064 (hereafter, OGLE-64) has been identified as a possible dwarf nova candidate due to the optical outburst activity recorded by the Optical Gravitational Lensing Experiment (OGLE) survey. We study the X-ray properties of OGLE-64 using the Chandra archival data. OGLE-64 shows an X-ray luminosity of $L_X \approx 1.5 \times 10^{32}$ erg/s in the 0.5–7 keV energy band and a high ratio of X-ray flux to optical flux $F_X/F_{\rm opt} \approx 1.5$. We found no significant optical and X-ray periodicity with the timing analyses. The X-ray spectrum of OGLE-64 can be approximated by a power-law model with a photon index of $\Gamma \approx 1.9$ and an optically thin plasma model with a temperature of $kT \approx 6.4$ keV. The isobaric cooling flow model gives an accretion rate in the system of about $\dot{M}_{\rm acc} \approx 5.4 \times 10^{-11}$ $M_\odot$/yr and the white dwarf mass of $M_{\rm WD} \approx 0.8$ $M_\odot$. The X-ray properties and the optical outburst activity suggest that OGLE-64 is a dwarf nova.
stars: cataclysmic variables, dwarf novae, binaries, white dwarfs; X-ray: general
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