Variability of the period of the star DU Monocerotis,an RR Lyrae variable with the Blazhko effect |
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| Authors: | L N Berdnikov A Yu Kniazev V V Kravtsov E N Pastukhova |
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| Institution: | 1.Astronomy and Astrophysics Research Division,Entoto Observatory and Research Center,Addis Ababa,Ethiopia;2.Sternberg Astronomical Institute,Moscow State University,Moscow,Russia;3.South African Astronomical Observatory,Cape Town,South Africa;4.Southern African Large Telescope,Cape Town,South Africa;5.Special Astrophysical Observatory,Russian Academy of Sciences, Nizhnii Arkhyz,Karachai-Cherkessian Republic,Russia;6.Departamento de Fisica,Facultad de Ciencias Naturales, Universidad de Atacama,Copiapo,Chile;7.Institute of Astronomy,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | In 2012–2014 we obtained 3641 CCD frames of the fields of the RR Lyrae (AB subtype, P = 0.583 days) variable DU Mon with BV I c filters using the 76-cm telescope of the South African Astronomical Observatory (SAAO) and the 1-m telescopes of the Las Cumbres Observatory Global Telescope Network (LCOGT). Our observations confirmed the presence of the Blazhko effect that we suspected previously and allowed its period to be determined, \({P_{Bl}} = 60_ \cdot ^d52 \pm 0_ \cdot ^d03\). Using all of the available observations, we constructed an O–C diagram spanning a time interval of 86 years that revealed at least one abrupt change in the pulsation period (a decrease by 15.26 s). |
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