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The mass and angular momentum loss from the edge of the accretion disk and the evolution of cataclysmic binaries

Yu, K. N.; Huang, Run-qian

We give the mass and angular momentum loss from the edge of the accretion disk of a cataclysmic binary and model theoretically the effect of these losses on the evolution of the system. The results of the calculation show that the high-velocity mass outflows observed by IUE come from the edge of the disk and the angular momentum loss there could b…

A model for the accretion disk in the dwarf nova AB Draconis

Li, Zong-yun; Zhu, Ci-sheng; Ding, Yue-rong

A least squares fit to the dwarf nova AB Dra shows that the continuum spectrum predicted by a blackbody accretion disk model can roughly account for the IUE observations during the time of the explosion, while small discrepancies can be attributed to recombination radiation of an optically thin atmosphere and/or blackbody radiation from hot spots.…

Variation of QSO color indices with redshift

Fan, Xiao-hui; Chen, Jian-sheng

In this paper we discuss the effect of features in the spectrum of QSOs on their color indices and the consequent variation of the latter with the redshift. As the redshift increases, the various absorption features shortwards of the Lyα emission line enter into the visible region and alter the way in which the color indices vary with the redshift…

A morphological study of the circumstellar dust shell of Herbig Ae/Be stars

Wang, Jun-jie; Hu, Jing-yao

In this paper the Kurucz stellar atmosphere model is fitted to the observed IUE, IRAS, ground-based optical and near-infrared data of 22 Herbig Ae/Be stars. A statistical analysis is made based on energy balance between the central star and the circumstellar shell. It is concluded that the shells are disk-shaped.