Effects of gravity on the structure of post-shock accretion flows in magnetic cataclysmic variables

被引:100
作者
Cropper, M
Wu, KW
Ramsay, G
Kocabiyik, A
机构
[1] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
[2] Univ Sydney, Dept Phys, Res Ctr Theoret Astrophys, Sydney, NSW 2006, Australia
关键词
accretion; accretion discs; methods : data analysis; stars : fundamental parameters; novae; cataclysmic variables; white dwarfs; X-rays : stars;
D O I
10.1046/j.1365-8711.1999.02570.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We calculate the temperature and density structure of the hot post-shock plasma in magnetically confined accretion flows, including the gravitational potential. This avoids the inconsistency of previous calculations which assume that the height of the shock is negligible. We assume a stratified accretion column with 1D flow along the symmetry axis. Wie find that the calculations predict a lower shock temperature than previous calculations, with a flatter temperature profile with height. We revise previous determinations of the masses of the white dwarf primary stars, and find that for higher mass white dwarfs there is a general reduction in derived masses when the gravitational potential is included. This is because the spectrum from such hows is harder than that of previous prescriptions at intermediate energies.
引用
收藏
页码:684 / 690
页数:7
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