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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

IMPACT FACTOR 2018: 0.350

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Volume 21, Issue 1-2


Abell-35 Phenomena in Symbiotic Stars: Discovery of 1.2 and 6.4 Day Periods in VV8 (V471 Per)

U. Munari / A. Siviero
  • Department of Astronomy, University of Padova, Asiago, Italy Germany
  • Leibniz-Institut für Astrophysik Potsdam (AIP), Postdam, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ E. Tamajo
  • Department of Physics, University of Zagreb, Croatia Italy
  • INAF Astronomical Observatory of Padova at Asiago, Italy
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ M. Fiaschi / S. Dallaporta / G. Cherini / A. Frigo / F. Castellani / M. Graziani / S. Moretti / S. Tomaselli
Published Online: 2017-03-23 | DOI: https://doi.org/10.1515/astro-2017-0374


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 ΔB = 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 Abell-35 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.

Keywords: planetary nebulae; central star; stars; symbiotic binaries


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About the article

Received: 2011-09-01

Accepted: 2011-09-15

Published Online: 2017-03-23

Published in Print: 2012-06-01

Citation Information: Open Astronomy, Volume 21, Issue 1-2, Pages 180–183, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0374.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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