Non-Radial Pulsations in Components of Symbiotic Stars |
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| Authors: | N I Bondar V V ProkofÉva |
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| Institution: | (1) Crimean Astrophysical Observatory, Nauchny, Crimea, Ukraine, 98409 |
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| Abstract: | Photometric observations of symbiotic stars in the blue and in the red spectral regions make it possible to reveal non-radial
oscillations both of the cool and of the hot components. Light variations of red giants in the symbiotic systems CI Cyg and
AG Peg show several periods in the 10–80d range, interpreted as p-mode pulsations. These modes are excited by a bright spot produced by radiation flux from the hot
component. The spot moves on the red giant’s photosphere at a velocity close to the sound speed. During the active phase of
the symbiotic star CH Cyg, at least 25 frequencies of oscillations in the 150–6000 s range of periods were found in the light
of the white dwarf. Their features correspond to non-radial g-modes. In the frame of 2D gas dynamical non-adiabatic models,
the interaction between gas flows and the accretion disk leads to formation of a system of shock waves propagating towards
the compact object, which is one of possible mechanisms to excite non-radial pulsations of white dwarfs in symbiotic systems. |
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| Keywords: | stars symbiotic – white dwarfs – stars pulsations – stars individual AG Peg CH Cyg CI Cyg |
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