Astrophysics and Space Science

, Volume 18, Issue 2, pp 403–407 | Cite as

Some limits on cosmic-ray heating ofHI clouds by magnetic stars

  • B. N. G. Guthrie


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.


Power Density Early Part Small Contribution Interstellar Medium Main Sequence 
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Copyright information

© D. Reidel Publishing Company 1972

Authors and Affiliations

  • B. N. G. Guthrie
    • 1
  1. 1.Royal ObservatoryEdinburghScotland

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