期刊
ASTRONOMY & ASTROPHYSICS
卷 453, 期 3, 页码 1051-1057出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20064843
关键词
stars : white dwarfs; stars : abundances
We calculated diffusion timescales for Ca, Mg, Fe in hydrogen atmosphere white dwarfs with temperatures between 5000 and 25 000 K. With these timescales we determined accretion rates for a sample of 38 DAZ white dwarfs from the recent studies of Zuckerman et al. (2003, ApJ, 596, 477) and Koester et al. (2005, A&A, 432, 1025). Assuming that the accretion rates can be calculated with the Bondi-Hoyle formula for hydrodynamic accretion, we obtained estimates for the interstellar matter density around the accreting objects. These densities are in good agreement with new data about the warm, partially ionized phase of the ISM in the solar neighborhood.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据