On the origin of 'dividing lines' for late-type giants and supergiants

Details On the origin of 'dividing lines' for late-type giants and supergiants On the origin of 'dividing lines' for late-type giants and supergiants

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442l..25r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 442, no. 1, p. L25-L28

Mathematics

Logic

57

Giant Stars, Stellar Coronas, Stellar Magnetic Fields, Stellar Winds, Supergiant Stars, Dynamo Theory, Hertzsprung-Russell Diagram, Magnetic Flux, Plasma Control, Stellar Evolution

Scientific paper

We show how a change in the nature of the stellar dyanmo can lead to a transition in the topological character of stellar magnetic fields of evolved stars, from being mainly closed on the blueward side of the giant tracks in the Hertzsprung-Russell (H-R) diagram to being mainly open on their redward side. If such a topological transition occurs, then these stars naturally segregate into two classes: those having hot coronae on the blueward side, and those having massive cool winds on the redward side, thus leading naturally to the so-called dividing lines.

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