2000A&A...358..201I -
Astronomy and Astrophysics, volume 358, 201-207 (2000/6-1)
Signs of a dead disk in AE Aquarii.
IKHSANOV N.R.
Abstract (from CDS):
The mass-exchange picture in the close binary AEAqr is discussed in the frame of the pulsar-like white dwarf model (Ikhsanov,
1998A&A...338..521I,
1999A&A...347..915I). It is shown that within this approach a dead disk around the white dwarf magnetosphere is expected. The disk forms during (and/or just after) the outburst associated with the white dwarf spin-up -> spin-down state transition. In the current epoch the inner and the outer radii of the disk are evaluated as 5.5x10
10cm and 8x10
10cm, respectively, and the average mass-exchange rate in the system is 4.4x10
16g/s. About a half of the accretion energy is released in the boundary layer at the inner edge of the disk in the optical-UV (about 80%) and soft X-ray (about 20%) spectral domains. The mass exchange between the components is governed by the stream-fed mechanism of mass transfer through the L
1 point. The plasma inflowing from the secondary interacts with the outer edge of the dead disk and streams out from the system mainly at phases 0.25/0.75. The velocity of outflowing plasma in quiescence lies within the interval 380/550km/s and its temperature is about 10
4K. The other parts of the dead disk are relatively cool ~(2/3)x10
3K and contribute to the system radiation in the IR spectral region.
Abstract Copyright:
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Journal keyword(s):
stars: novae, cataclysmic variables - stars: magnetic fields - stars: pulsars: general - stars: individual: AE Aqr
Simbad objects:
1
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