Predictions of the X-ray emission of YY Orionis stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Radiative Heat Transfer, Shock Fronts, Stellar Mass Accretion, Stellar Models, X Ray Sources, X Ray Spectra, Cooling, Density Distribution, Heao 2, Pressure Distribution, Stellar Envelopes, Supersonic Flow, T Tauri Stars, Temperature Distribution, Velocity Distribution

Scientific paper

The hot cooling region of the accretion shock of YY Orionis stars is discussed as a source of X-ray emission. The expected X-ray spectrum together with the count rates expected to be measured by the Einstein Observatory have been calculated as a function of the density and velocity of the infalling matter, assuming spherically symmetric accretion. The calculations show that with a typical integration time of 1000 to 10,000 sec there should be a good chance to detect nearby (r 150 pc) YY Orionis stars with the Einstein Observatory and future X-ray telescopes, provided the envelope densities are sufficiently small and the infall velocities are sufficiently high.

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