cepheid variable中文什么意思
造父变星
- cepheid: (variable) 【天文学】造父 ...
- variable: adj. 1.易变的,变化无常的,无 ...
- beat cepheid: 拍合造父变星
例句与用法
更多例句: 上一页 - Cepheid variables are dimmer than the type i supernova . as a result , the supernova allows us to measure the distances of galaxies further away , but it happens much less often
I型超新星比造父变星光亮,所以能够量度更遥远星系的距离,唯一缺点是不经常有i型超新星爆发。 - Astronomers made observations of cepheid variable stars [ pictured above ] ? pulsating stars used to measure vast distances ? in the virgo and other clusters to establish the expansion rate and the universe ' s age
天文学家用哈勃观测到仙女星座和其它星群中的造父变星(如图) ,以确定宇宙的膨胀速度和宇宙的年龄。 - The longer the period , the brighter the star is . thus , by measuring the period of a cepheid variable , we know its absolute magnitude , hence , we can tell how far it is away by comparing with its apparent magnitude
所以,只要知道某一造父变星的周期,我们便可得知它的绝对星等,只要和它的视星等作比较,便可以求得它和我们的距离。 - We have to use some other methods to measure the luminosity or equivalently the absolute magnitude of the cepheid variable . since we can readily measure the apparent magnitude of a cepheid variable , to measure the luminosity means measuring the distance . we use some distance measurement methods , for example , parallax , to determine the relation
要弄清这个关系,我们要知道不同造父变星的光度和光变周期数据,量度光变周期当然不是问题,但要得知一颗恒星的光度,我们首先要得知它的距离,这时便须借助好像视差法等其他量度天体距离的方法。 - Except those celestial objects of several hundred light years , astronomers rely primarily on cepheid variables for measuring distances of celestial objects . using ground telescopes to gauge cepheid variables enable us to directly measure celestial objects within 20 to 30 millions light years . for more distant stars , other methods have to be used
除了几百光年内的星体外,天文学家很主要倚靠测量造父变星来计算天体的距离,利用地面望远镜测量造父变星,可直接给出约二三千万光年内星体的距离,而对于更遥远的星体,天文学家便要借助其他方法,但这些方法还是需要利用造父变星来作校正。
百科释义
A Cepheid ( or ) is a member of a class of very luminous variable stars. The strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important standard candles for establishing the Galactic and extragalactic distance scales.
详细百科解释