JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2016, Vol. 51 ›› Issue (5): 48-60.doi: 10.6040/j.issn.1671-9352.0.2015.164

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The investigation of the gravity darkening and evolution in rotating star

TAI Li-ting1, SONG Han-feng1,2,3*, WANG Jiang-tao1, ZHAN Qiong1   

  1. 1. Department of Physics, College of Science, Guizhou University, Guiyang 550025, Guizhou, China;
    2. Key Laboratory for the Structure and Evolution of Celestial, Objects, Chinese Academy of Sciences, Kunming 650011, Yunnan, China;
    3. Joint Research Centre for Astronomy, National Astronomical Observatory-Guizhou University, Guiyang 550025, Guizhou, China
  • Received:2015-04-17 Online:2016-05-20 Published:2016-05-16

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Abstract: Rotation and tide are two important factors which have very important impact on the stellar structure and evolution. Based on the observational data of Achernar, we have investigated the gravitational darkening with the models including the effects of rotation and tide. We find that the rotating binaries can be more consistent with the observations of the ratio of equatorial radius to the polar one than the single rotating model. It is shown that the star with the initial larger angular velocity has bigger radius and central density at the beginning and middle of the main sequence, and it has smaller radius and central density due to the large loss of spin angular momentum in subsequent evolution. Also, we have found that rotation can make the star more centrally condensed and enlarged in size, decreasing the quadrupolar momentum, the gyration radius, central temperature, and the rate of the hydrogen production energy in the stellar core. The star shifts towards low temperature and luminosity in the HR diagram in rotating model.

Key words: gravitational darkening, stellar structure and evolution, tide, rotation

CLC Number: 

  • P153
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