| 其他摘要 | Algol-Type binary system is a subtype of binary system, the unique semi-detached structure make it have abundant physical phenomena ,including dramatic distorted semi-detached component star, strong magnetic activities, kinds of mass transfer form, the completely different evolutional track from single stars and its exclusive history of formation. In this paper, the fundamental physics of light curves are introduced, and various of models or programs in history are also introduced. The influence of different parameters on light curves are shown, including inclination, temperature, abundance, surface gravity, the third light, radius, orbital eccentricity, argument of periastron. Based on the current catalog, the statistic characteristics of Algol-Type binaries are studied. Three individual Algol samples are observed and analysed in detail. The results are as follows: 1. The Algol-Type binary stars are studied statistically, the results support the previous conclusion that most of the detached component stars are main sequence stars. The distribution of the mass ratio agrees on our theoretical calculation of the critical value of mass ratio in Algol-Type stars. A lower limit of radius ratio is suggested. The temperature, luminosity, radius and mass of the component stars in Algol-Type binaries are found with good correlations. 2. The binary system FG Gem is observed and analysed. Based on the solutions of large different combinations of temperature and luminosity, a new method of comparing age is used to get the conclusion that FG Gem is a semi-detached system. A new method of temperature searching is used to get a better estimated temperature of the detached component star. For the special orbital period changes, a reason of the combination of the intermittent mass flow and the continuous magnetic braking is suggested. 3. Taking VV Vir as an example, some properties of the mass flow in a semi-detached binary are discussed. Some of the properties can reflect the common characters of the mass flow in the Algol systems, including that: The radius of the mass flow is very small, so does its impact spot. If the mass transfer rate is large, the energy transfer rate can be comparable to the intrinsic luminosity of the detached component star. The position of the impact spot can be determined by the orbital period, mass ratio and the dimensionless potential. The temperature of the impact spot is very high, and it can be reflected by the humps on the light curves directly. 4. A rare Algol-type binary system V753 Mon that is just at the process of mass ratio inversion is discovered. The mass ratio of this binary is very close to one, and the key evolutional stage provides a important observational sample source for the theory of binary evolution. |
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