The origin of strong magnetic fields in circumstellar SiO masers.

Details The origin of strong magnetic fields in circumstellar SiO masers. The origin of strong magnetic fields in circumstellar SiO masers.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..589h&link_type=abstract

Astronomy and Astrophysics, v.319, p.589-592

Astronomy and Astrophysics

Astrophysics

19

Stars: Agb, Post Agb, Stars: Magnetic Fields, Stars: Mass Loss

Scientific paper

We suggest that the Parker instability, acting in the regions where shocks form in response to stellar pulsations, gives rise to the fragments in which SiO masers exist in the atmospheres of evolved stars. The production of maser fragments in this manner is compatible with the Alfven speeds in them greatly exceeding their kinematic and thermal speeds. The magnetic structure in an evolved star's envelope probably results in momentum transfer to gas from grains subject to radiation pressure being widely distributed even to regions where grains have not yet formed; the consequences for mass loss of the magnetic redistribution of momentum transfer require exploration.

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