The Chromospheric Radiation on the Circumstellar Shell of delta Andromedae

Details The Chromospheric Radiation on the Circumstellar Shell of delta Andromedae The Chromospheric Radiation on the Circumstellar Shell of delta Andromedae

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...502..909w&link_type=abstract

Astrophysical Journal v.502, p.909

Astronomy and Astrophysics

Astronomy

1

Stars: Chromospheres, Stars: Circumstellar Matter, Stars: Individual Constellation Name: Delta Andromedae, Stars: Late-Type

Scientific paper

We have calculated the ionization of the elements O, C, Mg, Si, S, and Fe and the dissociation of the molecules CO, OH, NH, CH, SiO, CN, C2, and H2O in the circumstellar envelope (CSE) of the red giant delta Andromedae (K3 III) due to the ultraviolet radiation of the chromosphere. This calculation is based on the penetration of the chromospheric UV radiation into the CSE and its effect on the wavelengths of absorption of the species listed. We show that O, C, Mg, Si, Fe, and SiO, which are important for dust formation, survive the harsh non-LTE environment close to the central star of delta And. Some implications for dust formation in the inner region of the CSE of delta And are presented.

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