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Cefeidy

Peremennye zvezdy-sverhgiganty, periodicheski izmenyayushie svoyu svetimost' i, sootvetstvenno, nablyudaemuyu yarkost'. Prototip zvezda $\delta$ Cefeya. Prichinoi peremennosti sluzhat kolebaniya radiusa i temperatury fotosfery (pul'sacii), voznikayushie iz-za narusheniya balansa mezhdu silami gravitacii, stremyashimisya szhat' zvezdu, i silami davleniya goryachego gaza i izlucheniya, stremyashimisya zvezdu rasshirit'.

U cefeid nablyudaetsya zavisimost' mezhdu svetimost'yu zvezdy i periodom ee pul'sacii, kotoraya pozvoyaet opredelyat' rasstoyaniya do udalennyh galaktik v kotoryh nablyudayutsya cefeidy.

V. G. Surdin, M. E. Prohorov
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Sm. takzhe: RS Kormy Blizkaya peremennaya zvezda – cefeida RS Kormy Sverhnovaya i cefeidy v spiral'noi galaktike UGC 9391 "VAR!" Eho ot RS Kormy Bredihinskaya premiya – 2007 Polyarnaya zvezda Vse publikacii na tu zhe temu >>

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