Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450..334b&link_type=abstract
Astrophysical Journal v.450, p.334
Astronomy and Astrophysics
Astronomy
2
Gamma Rays: Observations, Particle Acceleration, Stars: Novae, Cataclysmic Variables
Scientific paper
An analysis of the EGRET phase 1 data was made to search for γ-ray emission from the magnetic cataclysmic variables V834 Cen, VV Pup, and AM Her. These sources were not detected using either a steady (DC) or a periodic (AC) analysis. These results are consistent with the upper limit detected by the Whipple Observatory at TeV energies, if we assume that γ-rays are produced, via pion decay, from accelerated protons with a power-law energy spectrum of -2, and are inconsistent with a claimed detection at TeV energies by the Gulmarg Observatory. Our results show that the γ-ray luminosity from polars is less than 1 % of the bolometric luminosity and that the acceleration of particles (protons) to γ-ray energies by diffusive shocks is probably not important for polars.
Barrett Paul
Chanmugam G.
de Jager Ocker C.
Schlegel Eric
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