Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..275h&link_type=abstract
Acta Astronomica Sinica, vol. 52, no. 4, p. 275-287
Astronomy and Astrophysics
Astronomy
1
Stars: Evolution, Stars: Agb, Stars: Hertzsprung-Russell Diagram, Stars: Mass-Loss, Turbulence
Scientific paper
Stars with the initial masses in the range of 3≤ M/M_{&sun;}≤ 10 have evolved from the main-sequence phase to the end of the asymptotic giant branch (AGB). The evolutionary tracks in the Hertzsprung-Russel diagram (HR diagram) are investigated. The temporal variations of the energy productive rate, density and temperature at the maximum of helium burning in the helium-shell, stellar radius, and the ratio of the luminosity at the upper border of helium-shell to that of the stellar surface are analyzed. The demarcation point from E-AGB to TP-AGB in HR diagram for the intermediate-mass stars are proposed. They are in excellent agreement with the millimetric observations of 119 carbonrich giants. In order to form continuous superwind, a mass-loss function, which is unaffected by the luminosity of stellar surface after the demarcation point, is possibly necessary.
Based on the above ideas, turbulent pressure has been taken into account for the mass-loss, structure and evolution of stars with masses of 5 M_{&sun;}. The effect of turbulent pressure cannot be overlooked in the TP-AGB phase, particularly for stellar mass-loss. Also, the possible physical factors influencing on the superwind during the TP-AGB phase are discussed.
Hong Ya-Fang
Jiang Shi-Yang
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