Coherent brightness modulations in the dwarf nova AT Cancri |
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| Institution: | 1. Laboratório Nacional de Astrofísica, Rua Estados Unidos, 154, CEP, Itajubá, MG 37504-364 Brazil;2. CBA Wisconsin, Luckydog Observatory, 65027 Howath Road, de Soto, WI 54624, USA;3. CBA Concord, 1730 Helix Ct., Concord, CA 94518, USA;4. CBA Ontario, Newcastle Observatory, 9 Laking Drive, Newcastle, ON L1B 1M5, Canada;5. AAVSO, Rolling Hills Observatory, 1643 Nightfall Drive, Clermont, FL 34711, USA;6. CBA Oregon, Jack Jones Observatory, 22665 Bents Road NE, Aurora, OR 97002, USA;7. CBA Wilts, 2 Spa Close, Highworth, Swingdon SN6 7PJ, UK;8. CBA Sierras, Sierra Remote Observatories, 44325 Alder Heights Road, Auberry, CA 93602, USA;9. CBA Illinois, Northbrook Meadow Observatory, 855 Fair Lane, Northbrook, IL 60062, USA;1. Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;2. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India;1. Physics Department, University of the Free State, Bloemfontein, 9300, South Africa;2. Astrophysical Sciences Division, Bhabha Atomic Research Center, Mumbai, 400 085, India |
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| Abstract: | Light curves of the Z Cam type dwarf nova AT Cnc observed during standstill in 2016 and 2018 are analyzed. On the time scale of hours, previous reports on periodicities, in particular the presence of negative superhumps, could not be confirmed. Instead, a modulation with a period equal to the spectroscopic orbital period was detected which we thus interpret as a manifestations of the binary revolution. It enables us to derive a more accurate value of 0.201634 ± 0.000005 days (or its alias of 0.021580 days) for the period. AT Cnc also exhibits a hitherto unreported modulation of 25.731 ± 0.005 min, stable in period but not in amplitude over the entire time base of two years of the observations. We tentatively interpret this modulation in the context of an intermediate polar model for the system. |
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