脈動變星
閱讀設定
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Dceph.jpg/220px-Dceph.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Polaris_time-lapse_illustrating_Cepheid_type_variability.gif/220px-Polaris_time-lapse_illustrating_Cepheid_type_variability.gif)
脈動變星,變星一類,光度有周期咁變,類似脈動,實情佢縮下脹下,光度跟住變,又叫脈動變光星。一七八四年九月十號天桴四發現會脈動變光[1]。幾個月後,又另有發現造父一有相同現象[2],因而又叫造父變星,成為典型。之後又發一啲星有同類變化。另又二型,矮型,又有異常型,又有雙模型,多模型。咁原本造父一咁就叫經典型。之間變化模式有啲差異。
喺赫羅圖上,有脈動變星不安定帶。變動周期以日計,亦有啲去到月計。
經典脈動變星,肉眼觀察分到變光,有造父一、天桴四、井宿七、金魚三等。
攷
[編輯]- ↑ Pigott, Edward (1785). "Observations of a new variable star". Philosophical Transactions of the Royal Society. 75: 127–136. Bibcode:1785RSPT...75..127P. doi:10.1098/rstl.1785.0007. S2CID 186212958.
- ↑ Goodricke, John (1786). "A series of observations on, and a discovery of, the period of the variation of the light of the star marked δ by Bayer, near the head of Cepheus. In a letter from John Goodricke, Esq. to Nevil Maskelyne, D.D.F.R.S. and Astronomer Royal". Philosophical Transactions of the Royal Society of London. 76: 48–61. Bibcode:1786RSPT...76...48G. doi:10.1098/rstl.1786.0002.
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