Some limits on cosmic-ray heating ofHI clouds by magnetic stars |
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| Authors: | B N G Guthrie |
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| Institution: | (1) Royal Observatory, Edinburgh, Scotland |
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| Abstract: | Estimates are made of the low-energy, cosmic-ray power generated by the rotational braking of magnetic Ap stars through interaction with the interstellar medium. The resulting cosmic-ray power density ( 1.4×10–29 J s–1 m–3) in the galactic plane is at least three orders too small to maintain the observed kinetic temperatures ( 100 K) ofHi clouds. About 0.4% ofHi clouds contain an Ap star; in such cases 1026 J s–1 may be generated by the star during the early part of its Main Sequence life-time, but this makes only a small contribution to the heating of the cloud. |
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