Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-02
Astron.Rep. 48 (2004) 588-596; Astron.Zh. 81 (2004) 648-657
Astronomy and Astrophysics
Astrophysics
LaTeX, 20 pages, 4 figures, to be published in Astron. Zh
Scientific paper
10.1134/1.1777276
A new mechanism explaining superoutbursts in binaries of SU UMa type is proposed. In the framework of this mechanism the accretion rate increase leading to the superoutburst is associated with formation of a spiral wave of a new "precessional" type in inner gasdynamically unperturbed parts of the accretion disc. The possibility of existence of this type of waves was suggested in our previous work (astro-ph/0403053). The features of the "precessional" spiral wave allow explaining both the energy release during the outburst and all its observational manifestations. The distinctive characteristic of a superoutburst in a SU UMa type star is the appearance of the superhump on the light curve. The proposed model reproduces well the formation of the superhump as well as its observational features, such as the period that is 3-7% longer than the orbital one and the detectability of superhumps regardless of the binary inclination.
Bisikalo Dimitry V.
Boyarchuk Alexander A.
Kaygorodov Pavel V.
Kuznetsov Oleg A.
Matsuda Takuya
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