Ultraviolet and infrared observations of stars with 'quenched' chromospheres and the nature of mass loss

Details Ultraviolet and infrared observations of stars with 'quenched' chromospheres and the nature of mass loss Ultraviolet and infrared observations of stars with 'quenched' chromospheres and the nature of mass loss

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..859s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. 859-867.

Astronomy and Astrophysics

Astrophysics

36

Chromosphere, Infrared Spectra, Interstellar Matter, Red Giant Stars, Stellar Mass Ejection, Ultraviolet Spectra, Interstellar Gas, Interstellar Masers, Stellar Envelopes

Scientific paper

Previous observational evidence implies that the presence of Ca II emission, a chromospheric indicator, is correlated with the gas/dust ratio in the envelopes of red giant and supergiant stars. An attempt is made to determine whether this correlation can be generalized to all chromospheric activity indicators and the gas/dust ratio. New ultraviolet observations address the strength of UV emission features and the fraction of the total chromospheric flux emitted in various lines. Evidence is found that chromospheres are not completely quenched in the presence of dust, but that significant alteration of relative radiative loss patterns may occur. These observations are interpreted in terms of an instability that converts warm, chromospheric gas into near-surface dust grains and cool gas capable of supporting molecular masing. This supports the dust-driven mass loss scenario for red giant winds.

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