ASTR-1010 Lecture Notes - Lecture 15: Open Cluster, Stellar Evolution, Henrietta Swan Leavitt
24 Feb 2017
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O & b stars burn fuel like a bus! M stars burn fuel like a compact car! Our sun will last 1010 years on the main sequence: ms lifetime = 1010 years/ m2. 5. For example: b star (10 m) lasts, f star (2 m) lasts, m star (. 5 m) lasts. The universe 1. 4 x 1010 years old. Every m star that was every created is still on the main sequence! There is a region on the h-r diagram where all stars within it are variable. 2 types: cepheid stars and the rr lyrae stars. She studied the behavior of cepheid variable stars in the megellenic clouds. She discovered that si(cid:374)ce the cepheid stars are at the sa(cid:373)e dista(cid:374)ce fro(cid:373) us . F-g bright giants whose pulsation periods (1-100 days) get longer with increasing luminoisyt. Distance indicator!: how we can measure distance of stars beyond our own galaxy.
