恒星

Surprisingly, due to a close gravitational pass near one of these stars, T Tauri may now be headed out of the system.

令人惊讶的是，由於这些恒星的重力作用，使金牛座T星现在可能已经远离该系统。

The prototypical example is the variable star T Tauri , visible as the bright orange star near the image center.

这幅出色望远镜影像中央的橘红色恒星是金牛座T星，也是 T型变星的原型星。

Explanation: The orange star centered in this remarkable telescopic skyview is T Tauri, protoytpe of the class of T Tauri variable stars.

这幅出色望远镜影像中央的橘红色恒星是金牛座T星，也是T型变星的原型星。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

Technetium has only been naturally seen in S-, M-, and N-type stars.

锝在自然界中仅在S-， M-，和 N-型恒星中有发现。

The Li over-depletion in planetbearing main sequence stars is a generic feature over the Teff-restricted range Tsun±80 K and is independent of Teff.

在有效温度介于Tsun± 80 K "有行星"主序星中锂的过度消耗很具有普遍性，而且此现象基本上和恒星的有效温度或质量无关。

To improve the pointing accuracy of the telescope mount and the capability of daylight tracking, it is necessary to do more study on the error of telescope axes. The present thesis analyses many kinds of factors that cause the pointing error of telescope mount, and discusses the method for correcting the pointing error by setting up telescope mount model in detail.

本文详细分析了望远镜机架指向产生偏差的各种因素，讨论了通过建立望远镜机架指向误差模型的方法来修正望远镜机架指向误差的方法，通过使用CCD观测恒星来求解望远镜机架指向误差模型参数。

The galactic center of our Milky Way Galaxy is 26 degrees 54 minutes Sagittarius.

银河系中心我们银河系是26度54分的恒星。临近27度20100分钟。在银河系的中心是2012年27度1分。

In fact, the intensity of the star light that reaches the observer is inversely proportional to the square of the distance between the star and the observer.

事实上，一颗恒星的光到达观测者时的强度，和两者距离的平方成反比。

A thermonuclear reaction in the interior of stars.

在恒星内部发生的一种热核反应。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。