Relation of Velocity Distribution and Mass for DA White Dwarfstwo |
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| Authors: | Xiao-bo Gong Li-fang Li |
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| Institution: | 1. Yunnan Observatories, Chinese Academy of of Sciences, Kunming 650011;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011;3. University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | White dwarfs are the evolutionary endpoint of the low-and-medium mass stars. In the studies of white dwarfs, the mass of white dwarf is an important physical parameter. In this paper, we give an analysis about the velocity distribution of DA white dwarfs in the Sloan Digital Sky Survey (SDSS), and hope to find the relation between mass and velocity distribution of white dwarfs. We get the radial velocity and tangential velocity of every DA white dwarf according to their proper motion and spectral shift. Through analyzing the velocity distribution of DA white dwarfs, we find that the small-mass white dwarfs, which are produced from the single-star evolution channel, have a relatively large velocity dispersion. |
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| Keywords: | Stars: white dwarfs Stars: fundamental parameters stars: evolution |
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