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Cefeidy
Peremennye zvezdy-sverhgiganty, periodicheski izmenyayushie svoyu svetimost' i, sootvetstvenno, nablyudaemuyu yarkost'. Prototip zvezda
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.
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