Main Sequence on the Hertzsprung-Russell Diagram

赫茨斯prung- Russell 图的主序

About 90% of the known stars lie on the Main Sequence and have luminosities which approximately follow the mass-luminosity relationship. The Hertzsprung-Russell Diagram is a plot of luminosity vs temperature, except that the temperature is decreasing to the right on the horizontal axis. The luminosity is noted both in multiples of the Sun's luminosity and absolute magnitude.

大约90%的已知恒星位于主序带上，其光度大致遵循质量-光度关系。赫罗图是将光度与温度绘制成图，但温度在水平轴上是向右减小的。光度既以太阳的光度为单位表示，也以绝对星等表示。

Sun on main sequence

主序星上的太阳

Spectral types

光谱类型

Index

索引

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Mass-Luminosity Relationship

质量-光度关系

For main sequence stars, the luminosity increases with the mass with the approximate power law:

对于主序星，其光度与质量近似遵循幂律关系：

A more conservative approach used by a number of astronomy texts is to use a relationship with the power left as a range of values.

一些天文学教材采用更为保守的方法，即使用剩余功率作为值的范围。

The determination of a power relationship can be done by doing a log-log plot of the luminosities and masses. The slope of such a plot gives the power. Below is such a plot of data included in Harwit and attributed to the Royal Astronomical Society.

确定功率关系可以通过对光度和质量进行对数对数图来实现。这样的图的斜率即为功率。下面是一个包含在Harwit中的数据，并归因于皇家天文学家协会的此类图。

The power of 3.95 obtained from the upper part of this data shows the approach, but the range of masses is rather small. The value of 3.5 is most commonly used, and will be used in an estimate of stellar lifetimes.

Stellar lifetimes

恒星寿命

从这部分数据中得到的3.95的功率显示了方法，但质量范围相当小。最常用的值是3.5，将用于估计恒星寿命。

Index

Reference
Harwit
Ch 8

索引参考Harwit第8章

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