The Chromospheric Radiation on the Circumstellar Shell of Tx Piscium |
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| Authors: | J Wirsich |
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| Institution: | (1) Reichsstrasse 107, 14052 Berlin, Germany |
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| Abstract: | Using the chromospheric UV flux based on IUE data, we have undertaken a wavelength calculation of the rates of photodissociation and the a abundances of the relevant molecules CO, SiS, HCN and C2H2 for the inner region of the circumstellar shell of the carbon-rich star TX Psc. Shielding by heavy elements and dust was taken into account. Further, for CO, the line self-shielding as an additional shielding process was included. We find that the large influence of the shielding prevents the molecules from photodissociation in the internal layer of the shell of TX Psc. The possibility of detecting C2H2 via the equivalent widths of the infrared lines in the circumstellar shell is discussed. Finally, we estimate the antenna temperature and the luminosity of the fine-structure lines of CI]609µ and CII]158µ of the envelope of TX Psc, respectively. |
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