Be stars - Chromospheres and cool envelopes and their relation to magnetic fields

Details Be stars - Chromospheres and cool envelopes and their relation to magnetic fields Be stars - Chromospheres and cool envelopes and their relation to magnetic fields

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..463r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 463-470. Research supported by CONICET.

Astronomy and Astrophysics

Astrophysics

10

B Stars, Chromosphere, Stellar Magnetic Fields, Stellar Models, H Alpha Line, Line Spectra, Magnetohydrodynamics, Stellar Envelopes, Stellar Spectra

Scientific paper

The present paper discusses Be stars with nonexpanding cool envelopes observed at large inclination angles. It is suggested that high-ionization lines are formed in a chromosphere where the rise in temperature is partly due to dissipation of mechanical energy by braking forces, and that braking forces can be provided by a magnetic field. Further, it is shown how the same magnetic field that characterizes the chromosphere can produce an equatorial envelope (outside the chromosphere) when gravity is counterbalanced by radiation pressure and some particular conditions are fulfilled.

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