@article {22771,
	title = {The implications of ultra-high-energy activity in X-ray binary systems},
	volume = {169},
	year = {1986},
	month = {1986/11/1},
	pages = {373 - 379},
	abstract = {A mechanism for producing the high energy γ-ray spectrum of X-ray binaries exhibiting ultra-high-energy activity is proposed. γ-rays can result from decay of π<SUP>0</SUP> produced in collisions of energetic protons with the keV ambient photons. Consequently, the X-ray photons modify the produced primary spectrum by selectively absorbing the lower energy part of it. As a result of this differential absorption these systems should exhibit a power law spectrum of index 1.5 - 2.0. Moreover, these systems should have a high electron-positron pair number density that will lead to 511 keV annihilation line emission.},
	keywords = {Astrophysics, Electron-Positron Pairs, Energetic Particles, Gamma Ray Spectra, High Energy Interactions, Neutron stars, Pair Production, Pions, Stellar Luminosity, Stellar Spectra, X Ray Binaries},
	isbn = {0004-6361},
	url = {https://ui.adsabs.harvard.edu/abs/1986A\&A...169..373M},
	author = {Mastichiadis, A.}
}
