Short optical bursts and acceleration to TeV energies in AE Aquarii

Details Short optical bursts and acceleration to TeV energies in AE Aquarii Short optical bursts and acceleration to TeV energies in AE Aquarii

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268l...1d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

11

Cataclysmic Variables, Gamma Ray Bursts, Novae, Particle Acceleration, White Dwarf Stars, Light Curve, Power Spectra, Stellar Atmospheres, Stellar Spectrophotometry, Telescopes

Scientific paper

In this paper we give the first report of short optical bursts with rise- and decay times of a few seconds and about l-minute duration from the novalike variable AE Aquarii. With such short timescales and rapid light variations with large amplitudes, which is most probably associated with dynamic activity in the magnetosphere of the spinning white dwarf, we expect large electric fields to be generated from the induction equation of Faraday. The corresponding potential drop may be larger than during quiescence, and the luminosity involved in such a burst exceeds the quiescent luminosity, which improves the probability for burst-like detections at TeV gamma-ray energies. A l-minute burst from AE Aquarii was earlier reported in TeV gamma-rays at a significance level of 6 sigma. This gamma-ray event also revealed other convincing evidence in favor of gamma-ray emission from AE Aquarii, such as about 100 percent modulation at the 16.5 s period. A factor 10 enhancement in the amplitude of this periodicity was also seen in one of the optical bursts.

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