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Stellar ejecta from falling comet-like bodies: young stars

Published online by Cambridge University Press:  06 January 2014

Firuz S. Ibodov  and
Subhon Ibadov
Firuz S. Ibodov
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow, 119234Russia email: [email protected]
Subhon Ibadov
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow, 119234Russia email: [email protected] Institute of Astrophysics, Tajik Academy of Sciences, Dushanbe, Tajikistan email: [email protected]
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Abstract

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High-resolution spectral observations of young stars with dense protoplanetary discs like Beta Pictoris led to the discovery of variable emission lines of metal atoms, Na, Fe etc., that indicate the presence of fluxes of comet-like evaporating bodies falling onto the stars, FEBs. Assuming the presence of stellar atmospheres similar to the solar one, we show that passages of the FEBs through the stellar chromosphere and photosphere with velocities around 600 km/s will be accompanied by aerodynamic crushing of the nuclei, transverse expansion of the crushed matter, “explosion” of the flattened nuclei in a relatively very thin sub-photosphere layer due to sharp deceleration, and impulse production of a hot plasma. The impulsive rise of the layer's temperature and density lead to the generation of a strong “blast” shock wave and shock wave-induced ejection/eruption of hot plasma into space above the chromosphere. Observations of such impact-induced high-temperature phenomena are of interest for the physics/prognosis of stellar/solar flares as well as physics of comets.

Keywords

stars: individual (β Pic)stars: flarecomets: generalshock wavesSun: coronal mass ejections (CMEs)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S300: Nature of Prominences and their role in Space Weather , June 2013 , pp. 509 - 511
Copyright
Copyright © International Astronomical Union 2013 

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