Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012cha%26a..36...12h&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 36, Issue 1, p. 12-26.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Via a study of the evolutionary tracks of 3˜10 M stars on the Hertzsprung-Russell diagram, the variations of the energy, density, temperature at the peak of helium-shell burning, ratio of surface luminosity of helium shell to stellar surface luminosity as well as the stellar radius are analyzed. Then the demarcation point of medium-mass stars in the evolution from early AGB stars to thermally pulsing AGB stars on the HR diagram is determined, and for 119 carbon stars our analysis agrees rather well with observation. At the same time the following is suggested. After arriving at this demarcation point in stellar evolution, in the formula of the loss of stellar wind material it is probably needed to introduce a quantity which is not concerned with the surface luminosity, but it dominates the formation of super stellar wind. On this basis and via the analysis of the structure and evolution of 5 M stars as well as the rate of mass loss of stellar wind, it is found that the effect of turbulent pressure on the mass loss of stellar wind in the stage of thermally pulsing AGB stars is rather great, hence the turbulent pressure of thermally pulsing AGB stars cannot be overlooked. Furthermore, the physical factors which possibly affect the matter loss of the stellar winds of thermally pulsing AGB stars are suggested.
Hong Ya-Fang
Jiang Su-Yun
No associations
LandOfFree
The Demarcation Point from E-AGB Stars to TP-AGB Stars in HR Diagram for Medium-mass Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Demarcation Point from E-AGB Stars to TP-AGB Stars in HR Diagram for Medium-mass Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Demarcation Point from E-AGB Stars to TP-AGB Stars in HR Diagram for Medium-mass Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-909612