Abstract
I conducted photometry of the cataclysmic variable ASASSN-V J090756.65+715859.5 and detected eclipses that were not previously known. I observed 12 eclipses. Photometric data were obtained in two compact groups of nights separated by one year. Due to the large coverage of observations and due to the fact that all eclipses had a small scatter of points, I very precisely determined the orbital period, \(P_{\mathrm{orb}}=0.152331930\pm 0.000000040\) d. The eclipse profile was asymmetric similar to eclipse profiles seen in other cataclysmic variables. The eclipse depth varied in the range 0.83(1)–1.56(4) mag and strongly correlated with the out-of-eclipse magnitude, which showed only small variations resembling stunted outbursts of nova-like variables and was between 15.22(2) and 16.12(8) mag. Using the eclipse width at half the depth (0.0563(7) phases), I estimated the minimum inclination of the orbit (\(i > 73^{\circ}\)) and the maximum absolute magnitude of the disc, 5.5–5.6 mag. This suggests that ASASSN-V J090756.65+715859.5 is a nova-like variable. I derived the long-term eclipse ephemeris, the actual validity of which is 400 years. This ephemeris is very good for studying changes in the orbital period. In addition, this ephemeris is useful for computing the orbital phases.
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Data Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The work of V.P. Kozhevnikov was supported by the Ministry of science and higher education of the Russian Federation, agreement FEUZ-2023-0019. The author is grateful to the ZTF team for making their data available to the public. This research has made use of NASA’s Astrophysics Data System Bibliographic Services, the VizeR catalogue access tool (Ochsenbein et al. 2000) and the Aladin sky atlas developed at CDS, Strasbourg observatory, France (Bonnarel et al. 2000; Boch and Fernique 2014). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium).
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Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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I, Valerij Kozhevnikov, is the only author of the manuscript. All content of the manuscript is prepared by me.
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Kozhevnikov, V.P. Discovery of eclipses in the cataclysmic variable ASASSN-V J090756.65+715859.5. Astrophys Space Sci 368, 89 (2023). https://doi.org/10.1007/s10509-023-04245-8
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DOI: https://doi.org/10.1007/s10509-023-04245-8