<transcript><audio_62> nosotros tenemos su menor luminosidad y en cuanto se empiece a expandir, su luminosidad aumenta. Estrellas tipo cefeidas y tipolidas,</transcript><transcript><audio_63> de las estrellas cefeidas es que siguen una relación que se llama periodo luminosidad una relación periodo luminosidad estas estrellas fueron usadas por Hubble</transcript><transcript><audio_64> para determinar la expansión del universo, para encontrar la expansión del universo. Tenemos dos tipos de cefeidas, tipo 1 y tipo 2, y tenemos las estrellas RRF,</transcript><transcript><audio_65> Tenemos otro tipo de estrellas variables intrínsecas que son las eruptivas y básicamente a esta clase se deben todas las explosiones, estrellas, estrellas.</transcript><transcript><audio_66> tenemos estrellas Wolfrayet, ¿qué otro tipo de estrellas tenemos? Eruptivas, déjenme ver. Bueno, obviamente tenemos estrellas tipo flare, o sea, tipo llamaradas, ¿no? Que presentan esta</transcript><transcript><audio_67> Y justamente del lado derecho tenemos una curva de luz de una supernova, solamente para indicar cómo incrementa su brillo desde el momento en el que explota,</transcript> but with the radius contracted we have a lower luminosity and as soon as it begins to expand its luminosity Cepheid and League type stars. The interesting thing about specific stars is that they follow a relationship called period luminosity from a relationship period luminosity to  These stars were used by young, it seems to me to determine the expansion of the universe to find the expansion of the universe we have two types of stars type 1 type 2 and we have the r stars of how good we have another type of intrinsic variable stars that are  the eruptive ones and basically all the explosions are due to this class stars nova stars supernovae we have wolf rayet stars and other types of stars eruptive ones but well obviously we have flare type stars that present these these eruptions and just on the right side we have a light curve of a supernova just to indicate how its brightness increases from the moment it explodes so to
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