Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..172k&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
Effects of neutral gas (hydrogen and helium) accretion onto a cold (surface temperature about 0.3×10^5 K) neutron star are studied. Capture of charged particles from interstellar medium is suppressed because of electro-magnetic wave of neutron star magneto-dipolar radiation and ejected plasma with freezing-in magnetic field pressure. But the wave has no effect on neutral gas. Neutral gas is captured by gravity into neutron star magnetosphere, then it is ionized by surface thermal emission and then accelerated by electro-magnetic field of neutron star magnetosphere. Energy of accelerated particles transforms into gamma-ray emission and thermal energy of polar caps radiating in X-ray. It was calculated that neutron star with magnetic field 10^12 G and rotation period P=1 sec radiates most efficiently when it has surface temperature 0.3×10^5 K (accretion of hydrogen) and 0.45×10^4 K (accretion of helium). When concentration of interstellar gas is 1cm^{-3}, temperature of polar caps appears to be about 1.5×10^6 K and their X-ray radiation is about 2×10^29ergs s^{-1}. Such high level of radiation cannot be provided by retuning positron flux. Gamma radiation of neutron star with these parameters due to accretion is about 0.2×10^29ergs s^{-1} that is small in compare with radiation of primary electron beam 4×10^29ergs-1. The example of such source can be radio and X-ray pulsar J0826+2637. This work was supported by RFBR (project code 04-02-17590).
Kantor Elena M.
Tsygan Anatolii I.
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