Chromospheres and mass loss in metal-deficient giant stars

Details Chromospheres and mass loss in metal-deficient giant stars Chromospheres and mass loss in metal-deficient giant stars

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281l..37d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 281, June 1, 1984, p. L37-L39.

Astronomy and Astrophysics

Astrophysics

63

Chromosphere, Giant Stars, Globular Clusters, Stellar Mass Ejection, Atmospheric Models, H Alpha Line

Scientific paper

Semiempirical atmospheric models indicate that the characteristic emission in the wings of the Hα line observed in Population II giant stars can arise naturally within static chromospheres. Radial expansion gives an asymmetric, blueshifted Hα core accompanied by greater emission in the red line wing than in the blue wing. Wind models with extended atmospheres suggest mass loss rates much smaller than 2×10-9M_sun; yr-1. Thus Hα provides no evidence that steady mass loss can significantly affect the evolution of stars on the red giant branch of globular clusters.

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