Presentation on theme: "Astronomy 100 Are All Stars the Same?. Answer Now: Why does the Sun shine? Are all stars the same as our Sun? (How or how not?) Goal: – Be able to tell."— Presentation transcript:
Astronomy 100 Are All Stars the Same?
Answer Now: Why does the Sun shine? Are all stars the same as our Sun? (How or how not?) Goal: – Be able to tell me how stars are born – Know what stars are made of – Know how stars shine – (if we have time) Know how stars die Vocabulary: Planck curve, luminosity, H-R Diagram, absolute magnitude, apparent magnitude, fusion, H, He, CNO Cycle, protostar, nebula, protostar, hydrostatic equilibrium, interstellar medium, compression wave,
Planck Curve - Temperature DIRECTLY related to peak wavelength.
Luminosity – Apparent magnitude – Absolute magnitude – Luminosity is the total brightness Temperature or Type – Can tell temp from color – Can tell type from spectrum, temp or color Types: O, B, A, F, G, K, M
It all starts with gas Interstellar medium Gas cloud (nebula) Compression wave Pockets of compacted gas Gravity further squeezes gas PROTOSTAR! Squished enough (enough energy) fusion begins STAR!
And in the end… < 4 Solar Mass – when finished fusing H, begins to fuse He Ffffffft (planetary nebula) White dwarf/black dwarf > 4 Solar Mass – when finished fusing H, begins to fuse He – when finished fusing He, begins to fuse C, N, O (shells) Kerblewie! (supernova) Black hole/neutron star
Review – define 3 of the terms at the beginning of this lecture. Quiz Review
High Mass Stars My candle burns at both ends; It will not last the night; But ah, my foes, and oh, my friends-- It gives a lovely light. Emily Dickinson