absolute magnitude 中文意思是什麼
absolute magnitude
解釋
【天文學】絕對星等。-
Problems of urbanization are widely noted and studied, not only because of their absolute magnitude but also because of their visibility.
城市化的問題正在受到廣泛的注意和研究，不僅因為這些問題十分重要，而且非常突出。 -
For example, the apparent magnitude of our sun is - 26. 8, but its absolute magnitude is just 4. 8. the absolute magnitude describes the
例如太陽的視星等為- 26 . 9等，但它的絕對星等只有4 . 8等。 -
We know the luminosity is directly related to the absolute magnitude. so, in practice, we usually use absolute magnitudes instead
由於光度和絕對星等有直接的對應關系，所以很多時赫羅圖會選用絕對星等。 -
The hertzsprung - russell diagram serves this purpose. it is a plot of absolute magnitude against surface temperature i. e., spectral type of stars
簡單來說，赫羅圖把大量恆星的絕對星等和表面溫度或譜型關系以圖表方式顯示出來。 -
Two stars have the same absolute magnitude. one is thousand times farther away than the other. what is the difference in apparent magnitudes ? which magnitude larger
兩顆星具有相同的絕對星等，其中的一顆比另一顆距離遠1000倍，它們的目視星等有何不同？哪一個的星等數值大？ -
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，只要知道某一造父變星的周期，我們便可得知它的絕對星等，只要和它的視星等作比較，便可以求得它和我們的距離。 -
A typical red supergiant could be about 100 times larger than the red giant. its surface temperature is low while the total luminosity remains high, with absolute magnitude up to - 10 comparing to 4. 8 of our sun
典型的超紅巨星比普通紅巨星大上100倍，雖然表面溫度低，但整體光度仍然非常高，絕對星等可達- 10太陽的絕對星等只有4 . 8 。 -
The second part is concerned with the comprehensive evaluation of relations between risks, their absolute magnitude and relative order of risks. methods of point rating and fuzzy integrative evaluation methods are employed here
對于整體風險的評價，則包括各類風險之間的關系，整體風險大小以及風險的排序三方面內容，主要採用了主觀評分法和模糊綜合評價法。 -
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
要弄清這個關系，我們要知道不同造父變星的光度和光變周期數據，量度光變周期當然不是問題，但要得知一顆恆星的光度，我們首先要得知它的距離，這時便須藉助好像視差法等其他量度天體距離的方法。 -
Absolute bolometric magnitude
絕對熱星等 -
Abstract : we have studied the polarization beats spectroscopy with phase - conjugation geometry in a cascade three - level system. it was found that the accuracy for the energy - level difference measurement is determined by the homogeneous linewidths of the optical transitions. under the condition for the occurrence of beating, the frequency difference of the beat between two independent light sources could exceed the laser linewidth. the measurement accuracy for laser absolute frequency could reach the same order of magnitude as the laser linewidth
文摘:研究了級聯三能級系統中的相位共軛極化拍頻光譜術.發現其對能級差的測量精度決定於光學躍遷的均勻增寬.在符合拍頻條件時，兩獨立光源拍頻的頻差可以超出激光線寬，激光絕對頻率的測量精度可達到與激光線寬同一量級
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