V4745 Sgr – a nova above the period gap and an intermediate polar candidate |
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| Authors: | A Dobrotka A Retter A Liu |
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| Institution: | Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Paulínska 16, 91724 Trnava, The Slovak Republic;Department of Astronomy and Astrophysics, Penn State University, 525 Davey Lab, University Park, PA 16802-6305, USA;Norcape Observatory, PO Box 300, Exmounth 6707, Australia |
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| Abstract: | A period analysis of CCD unfiltered photometry of V4745 Sgr (Nova Sgr 2003 #1) performed during 23 nights in the years 2003–2005 is presented. The photometric data are modulated with a period of 0.20 782 ± 0.00 003 d (4.98 768 ± 0.00 072 h) . Following the shape of the phased light curve and the presence of the periodicity in all data sets with no apparent change in its value, we interpret this periodicity as orbital in nature and this is consistent with a cataclysmic variable above the period gap. We found a probable short-term periodicity of 0.017 238 ± 0.000 037 d (24.82 272 ± 0.05 328 min) which we interpret as the probable spin period of the white dwarf or the beat period between the orbital and spin period. Therefore, we propose that nova V4745 Sgr should be classified as an intermediate polar candidate, supporting the proposed link between transition-oscillation novae and intermediate polars. The mass–period relation for cataclysmic variables yields a secondary mass of about 0.52 ± 0.05 M⊙ . |
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| Keywords: | stars: individual: V4745 Sgr novae cataclysmic variables white dwarfs |
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