Assuming that the terminated mass is confined within the range 0.4551-0.5813M when the sun is going to evolve into a white dwarf, the velocity of the sun projecting the shell in the PN stage is much greater than the revolving velocity of the earth-like planet, therefore, we think that the solar mass change is instantaneous.Key words. Sun-orbit-dwarf.
Enveloping model on solar projection in the PN stageThe total solar mass is (M c + M env ), where M c is the mass of core, and M env is the projecting mass of the enveloping layer. The shells hit the companion stars according to their own speed. Based on the study of Villaver & Stanghellini (2005), we assume that the initial velocity of the projecting material of the solar enveloping layer v env0 = 2 × 10 4 km s −1 , and the velocity of the enveloping layer decays according to the exponential formwhere r is the position of the planet, and r J is the distance of Jupiter.
Orbital eccentricity of the planetWhen v env is big enough, the physical radius of the collision cross section is approximately equal to R, therefore, the planets accept the matter M env πR 2 /4πr 2 0 coming from the solar shell. These matter hits the planets at a velocity v env , and produce a radial momentum of the planet with a radius R.The radial velocity obtained by the planets is v r = M env R 2 4r 2 0 v env e − r r J .
Under the current environment of new media, with the rapid development of new media technology, it is an inevitable choice to inherit and protect the intangible cultural heritage in Zhuhai in a more efficient way by digital media technology. The new media technology can bring new thought and new method for the protection and inheritance of intangible cultural heritage in Zhuhai. On the basis of the current status of intangible cultural heritage, this paper elaborates the advantages of the new media technology protection method for intangible cultural heritage, and emphasizes the necessity of conducting research and reasonable development in the new media digital technology transmission process of intangible cultural heritage without losing the national spirits and inheritance blood of cultural heritage. Meanwhile, it is also requested to respect and revere the ecological environment generated by intangible cultural heritage and the cultural space formed thereby.
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