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Identification of SRGt 062340.2-265715 as a bright, strongly variable, novalike cataclysmic variable

Authors :
Schwope, Axel
Buckley, David A. H.
Kawka, Adela
König, Ole
Lutovinov, Alexander
Maitra, Chandreyee
Mereminskiy, Ilya
Miller-Jones, James
Marcano, Manuel Pichardo
Rau, Arne
Semena, Andrei
Townsend, Lee J.
Wilms, Jörn
Schwope, Axel
Buckley, David A. H.
Kawka, Adela
König, Ole
Lutovinov, Alexander
Maitra, Chandreyee
Mereminskiy, Ilya
Miller-Jones, James
Marcano, Manuel Pichardo
Rau, Arne
Semena, Andrei
Townsend, Lee J.
Wilms, Jörn
Publication Year :
2021

Abstract

We report the identification and follow-up of the transient SRG 062340.2-265715 detected with both instruments on board the Spektrum-Roentgen-Gamma mission. Optical spectroscopy of the G=12.5 counterpart firmly classifies the object as a novalike cataclysmic variable (CV) at a distance of 495 pc. A highly significant TESS period of 3.941 hours, tentatively identified with the orbital period of the binary, could not be found when the object was reobserved with TESS two years later. The newer high-cadence TESS data revealed quasi-periodic oscillations around 25 min, while ground-based photometry indicated periodic variability at 32 min. Located in very sparsely populated regions of color-magnitude diagrams involving X-ray and optical magnitudes and colors, the new object could be an X-ray underluminous magnetic CV, an intermediate polar, or an overluminous nonmagnetic CV. The lack of uniquely identified spin and orbital periods prevents a final classification. The site of X-ray production in the system, L(X, bol) = 4.8 x 10^{32} erg/s, remains to be understood given its high variability on long and short timescales.<br />Comment: 9 pages, 16 figures, to appear on A&A, Special Issue: The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG Mission

Details

Database :
OAIster
Publication Type :
Electronic Resource
Accession number :
edsoai.on1363548395
Document Type :
Electronic Resource
Full Text :
https://doi.org/10.1051.0004-6361.202141153