ASTR 3 Lecture Notes - Lecture 19: Nebular Hypothesis, Protostar, Main Sequence
Document Summary
The luminosity nearly depends entirely on the mass. Where does a cloud come from: interstellar medium. (things between stars) The composition of gas is basically the same as the sun: hydrogen and helium. Scattering is more prominent regarding those with a smaller wavelength. the infrared goes through, some red light goes through, but all blue light is scattered. Hot, tenuous gas: emission line spectrum: reflection nebulae: lots of dust. Dust scatters the blue light, make it look more blue to us (sunlight scattered): d(cid:28660)(cid:28677)(cid:28670) (cid:28662)(cid:28671)(cid:28674)(cid:28680)(cid:28663): (cid:28663)(cid:28674)(cid:28664)(cid:28678)(cid:28673)"(cid:28679) (cid:28660)(cid:28675)(cid:28675)(cid:28664)(cid:28660)(cid:28677) (cid:28679)(cid:28674) (cid:28667)(cid:28660)(cid:28681)(cid:28664) (cid:28678)(cid:28679)(cid:28660)(cid:28677)(cid:28678), (cid:28661)(cid:28680)(cid:28679) (cid:28678)(cid:28679)(cid:28660)(cid:28677) (cid:28671)(cid:28668)(cid:28666)(cid:28667)(cid:28679) (cid:28668)(cid:28678) (cid:28669)(cid:28680)(cid:28678)(cid:28679) (cid:28673)(cid:28674)(cid:28679) (cid:28660)(cid:28661)(cid:28671)(cid:28664) (cid:28679)(cid:28674) (cid:28666)(cid:28664)(cid:28679) through the thick gas. A million times more dense than average interstellar medium, cold, and have many molecules. I(cid:28679)"(cid:28678) (cid:28660)(cid:28671)(cid:28678)(cid:28674) (cid:28661)(cid:28671)(cid:28674)(cid:28662)(cid:28670)(cid:28668)(cid:28673)(cid:28666) (cid:28671)(cid:28668)(cid:28666)(cid:28667)(cid:28679) (cid:28679)(cid:28667)(cid:28660)(cid:28679)"(cid:28678) (cid:28665)(cid:28677)(cid:28674)(cid:28672) (cid:28679)(cid:28667)(cid:28664) outside so that the molecules within survive. A molecule is one or two atoms bound in a certain way.
