Browsing by Author "Cherini, G."
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- ItemAbell-35 phenomena in symbiotic stars: Discovery of 1.2 and 6.4 day periods in VV8 (V471 per)(Vilnius : Lithuanian Astronomical Union, 2012) Munari, U.; Siviero, A.; Tamajo, E.; Fiaschi, M.; Dallaporta, S.; Cherini, G.; Frigo, A.; Castellani, F.; Graziani, M.; Moretti, S.; Tomaselli, S.We have collected high precision optical photometry of VV8, so far 782 individual observing runs uniformly distributed over the period 2005-2011. This dataset allows us to refine the known long periodicity of VV8 to P = 16.8 yr, with peak-to-valley amplitudes of ΔB = 0.18 and ΔV = 0.14 mag. In addition, we have discovered two new periodicities: 6.431 d (total amplitude Δ = ΔV = ΔI= 0.05 mag) and 1.185 d (ΔB = 0.022, ΔV = 0.018, ΔI = 0.014 mag). These two short periods are reminiscent of the Abell35 phenomena displayed by binary nuclei of planetary nebulae that have gone through a common envelope phase. Twice the 6.431 d period would nicely correspond to the double-peaked light-curve that the G5 III star in VV8 would display if its Roche lobe would be ellipsoidally distorted.