一颗恒星其生命的绝大部分处于主序星阶段，在这一阶段它包含一个核心、辐射区和对流区、光球层、色球层和日冕。
A star during most of its life is a main-sequence star, which consists of a core, radiative and convective zones, a photosphere, a chromosphere and a corona.
这颗恒星曾和太阳一样，是颗“主序星”(“main sequence”)。它通过核聚变燃烧氢，从而产生氦。
The star used to be like the sun, a "main sequence" star that burns hydrogen by nuclear fusion, producing helium.
在从样本星的色指数（B -V） ，（U -B）和视差得到它们的有效温度和光度之后，我们发现在赫罗图上它们大多数是位于主序带内的。
After deriving their effective temperatures and luminosities from their (B-V), (U-B) colors and parallaxes we find their positions in the HR diagram to be mostly confined to the main sequence.
在历经主序星、红巨星和白矮星或中子星后演化为致密星体而结束一生。
During the radiation stars will develop in turn into main sequence stars, red giants, white dwarfs or neutron stars, etc.
太阳剩余磁场是指形成于太阳主序星阶段之前，深藏在太阳辐射核内部的原始磁场。
It is really possible that the Sun possesses a relic magnetic field of the pre-main sequence epoch in its radiative core.
在第一部分引言中，说明现代恒星演化学说的分歧主要是在恒星形成主序星以后的演化。
In the first introductory part it is pointed out that the main difference among current theories of stellar evolution is in the evolutionary stage after stars move onto the main sequence.
在第一部分引言中，说明现代恒星演化学说的分歧主要是在恒星形成主序星以后的演化。
In the first introductory part it is pointed out that the main difference among current theories of stellar evolution is in the evolutionary stage after stars move onto the main sequence.
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