The multi-frequency properties of AE Aquarii and its evolution from a high mass transfer history.
Abstract
The multi-frequency properties of the novalike variable AE Aquarii has been reviewed within the framework of its secular evolution and a very effective magnetospheric propeller process. It has been shown that a run-away thermal mass transfer occurred, exceeding dot {M}2 > 1019 g s-1, between 2.7 > q > 0.73. This resulted in the presence of an accretion disc spinning the white dwarf up to a very short period of ∼ 33 s. Thermal time scale mass transfer for q < 0.73 decreased to dot {M}2 ∼ 1017 g s-1, which is propelled out of the system by the fast rotating magnetosphere. The very peculiar broad band emission from radio to possibly TeV gamma-rays is a manifestation of the propeller driven spin-down power of the white dwarf, which is L_prop ∼ 1034 erg s-1. This may put AE Aquarii in the class of rotation-powered pulsars, and provide an attractive framework to explain the earlier reports of the transient VHE-TeV gamma-ray emission.
- Publication:
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Memorie della Societa Astronomica Italiana
- Pub Date:
- 2012
- Bibcode:
- 2012MmSAI..83..643M
- Keywords:
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- binaries: cataclysmic variables: radiation mechanisms: non-thermal;
- pulsars: individual: AE Aquarii;
- X-rays