Astronomy 1021 Lecture Notes - Lecture 16: Gravitational Energy, Subgiant, Helium Flash
4 Oct 2018
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*know all constellations for midterm + this lecture will not be on the. To collapse a cloud, however, you need higher density and cooler temperature than surrounding gas. Only a few million years old; again lots of dust and gas. Winds and jest eject disk and any remaining cocoon. Lower limit: 0. 08 m sun (or 80m jup) Halts contraction before core temperature becomes hot enough for fusion. The higher the density, the faster they move trying to avoid running into one another. Just like thermal pressure, degeneracy pressure resists gravity. Unlike thermal pressure, degeneracy pressure does not depend on temperature - only on density. Therefore, increasing temperature does not increase degeneracy pressure. Mass lower than 0. 08 m sun (or about 80 m jup) Radiation pressure limits how massive a star can be without blowing itself apart. Observations show that star formation makes many more low0mass stars than high-mass stars. Star birth: when hot enough to fuse h.
