Multicolor Photometry of the SU Majoris Dwarf Nova V1504 Cygni (Englisch)

in Astrophysics ; 45 , 1 ; 1-7


On the basis of multicolor observations of the dwarf nova V1504 Cyg, made from 1988 to 2001 at the Crimean Astrophysical Observatory and at the Crimean Laboratory of the P. K. Shternberg State Astronomical Institute in bands of the standard BVR photometric system, the brightness characteristics and color indices were obtained for a superoutburst and normal outbursts of the star. At an outburst maximum V1504 Cyg is bluer than at a minimum, with the ascending branch of an outburst being characterized by “redder” color indices than the descending branch. A detailed analysis of the behavior of two outbursts is consistent with Smak's model A, in which an outburst is caused by temperature instability developing first in the outer parts of the accretion disk around the compact component of the binary system and propagating into the inner parts. The characteristics of the other outburst are consistent with Smak's model B, in which instability develops first in the inner parts of the disk. It is suggested that type A outbursts are typical of V1504 Cyg, while type B outbursts are rare.

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Multicolor Photometry of the SU Majoris Dwarf Nova V1504 Cygni
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