Identification of SRGt 062340.2-265751 as a bright, strongly variable, novalike cataclysmic variable

Schwope A, Buckley DAH, Kawka A, König O, Lutovinov A, Maitra C, Mereminskiy I, Miller-Jones J, Marcano MP, Rau A, Semena A, Townsend LJ, Wilms J (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Astronomy & Astrophysics EDP Sciences

Book Volume: 661

DOI: 10.1051/0004-6361/202141153

Abstract

We report the identification and follow-up of the transient SRGt 062340.2-265751 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 h, 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,L-bol = 4.8 x 10(32) erg s(-1), remains to be understood given its high variability on long and short timescales.

Authors with CRIS profile

Ole König Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Jörn Wilms Lehrstuhl für Astronomie und Astrophysik

Involved external institutions

Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam DE Germany (DE) Curtin University AU Australia (AU) Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS) RU Russian Federation (RU) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics DE Germany (DE) Texas Tech University (TTU) US United States (USA) (US) South African Astronomical Observatory (SAAO) ZA South Africa (ZA)

How to cite

APA:

Schwope, A., Buckley, D.A.H., Kawka, A., König, O., Lutovinov, A., Maitra, C.,... Wilms, J. (2022). Identification of SRGt 062340.2-265751 as a bright, strongly variable, novalike cataclysmic variable. Astronomy & Astrophysics, 661. https://dx.doi.org/10.1051/0004-6361/202141153

MLA:

Schwope, Axel, et al. "Identification of SRGt 062340.2-265751 as a bright, strongly variable, novalike cataclysmic variable." Astronomy & Astrophysics 661 (2022).

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