Original title: Activity of the Polar AM Her (RX J1816.2+4952): A Short Review
Authors: Šimon, Vojtěch ; Henden, A.
Document type: Papers
Conference/Event: Workshop on the golden age of cataclysmic variables and related objects /2./, Palermo (IT), 2013-09-09 / 2013-09-14
Year: 2015
Language: eng
Abstract: We show that AM Her displays the transitions between the high and low states with an intermittently existing dominant\ncycle with length between 400 and 800 days. Moreover, these transitions accumulate in clusters, which produces an\nadditional long cycle after smoothing; a single isolated short episode of the low state does not suggest a break of this cycle. The seasons of existence of the cycle can be controlled by the lifetime of the active regions (e.g. prominences, spots) on the donor. In some high-state episodes, a higher luminosity of the bremsstrahlung emission is not accompanied by a higher optical (cyclotron+stream) emission. Part of the bremsstrahlung emission can be buried in some episodes. Changes of\nthe structure of the accretion region(s) are necessary to explain the variations of the optical and X-ray activity in the\nhigh-state episodes of AM Her.
Keywords: catalysmic variables; emission mechanism; polars
Host item entry: The golden age of cataclysmic variables and related objects - II, ISBN 9788001056882

Institution: Astronomical Institute AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0256168

Permalink: http://www.nusl.cz/ntk/nusl-201524


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