Effects of suprathermal grains

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Interstellar Gas, Particle Acceleration, Particle Interactions, Stellar Mass Ejection, Grains, Heat Sources, Radiation Effects, Radiation Pressure, Stellar Evolution

Scientific paper

Grains ejected from stars at velocities of the order of 10 million cm/sec and grains accelerated by the pressure of starlight in the intercloud medium to velocities in the range between 2 and 10 million cm/sec are slowed to velocities of about 200,000 cm/sec in a typical interstellar cloud. The interaction of fast grains with gas atoms as they are slowed in clouds could provide (1) the dominant heat source for interstellar clouds, (2) sites for molecule formation, and (3) a mechanism for providing a pressure balance between clouds and the intercloud medium.

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