NDLI: Non-Radial Pulsations in Components of Symbiotic Stars

Content Provider	Springer Nature Link
Author	Bondar, N. I. ProkofÉva, V. V.
Copyright Year	2005
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.
Starting Page	161
Ending Page	164
Page Count	4
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	296
Issue Number	1-4
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	stars symbiotic – white dwarfs – pulsations – individual AG Peg CH Cyg CI Cyg Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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