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单词 Horizontal branch
释义

Horizontal branch

原声例句
优山美地

The cones are grayish-green when ripe, cylindrical, from three to four inches long, and one and a half to two inches wide, and stand upright on the upper horizontal branches.

球果熟时呈灰绿色, 圆柱形,长三四寸,宽一寸半至二寸, 直立在上部横枝上。

加州的群山(下)

Finally, growing calmer, he settles down in a comfortable posture on some horizontal branch commanding a good view, and beats time with his tail to a steady " Chee-up! chee-up" ! or, when somewhat less excited, " Pee-ah" !

最后,它变得平静下来, 以舒适的姿势在视野开阔的水平树枝上安顿下来, 用尾巴打拍子, 发出稳定的“振作起来!振作起来” !或者,当不那么兴奋时, “Pee-ah” !

中文百科

水平分支

水平分支HB)是质量与太阳相近的恒星,紧接在红巨星分支后面的一个恒星演化阶段。水平分支恒星的能量来自核心的氦融合(经由3氦反应)和围绕着核心的新壳层的氢融合。水平分支的名称来自于这些恒星在色-光图上几乎是水平的排列者。许多水平分支星都是脉动的天琴座RR变星。

另一类属于所谓的红群聚恒星,是第一星族星(相对较年轻的)的恒星,而HB恒星是第二星族星。

英语百科

Horizontal branch 水平分支

H-R diagram for globular cluster M5, with the horizontal branch marked in yellow, RR Lyrae stars in green, and some of the more luminous red giant branch stars in red
Color–magnitude diagram for the globular cluster M3
The evolutionary track of a sun-like star, showing the horizontal branch and red clump region

The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core. The onset of core helium fusion at the tip of the red giant branch causes substantial changes in stellar structure, resulting in an overall reduction in luminosity, some contraction of the stellar envelope, and the surface reaching higher temperatures.

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更新时间:2025/6/18 14:40:53