AST 101 Lecture Notes - Lecture 10: Stellar Classification, Annie Jump Cannon, Absorption Spectroscopy

• School: Stony Brook University
• Department: Astronomy
• Course: AST 101
• Professor: Jin Koda

Document Summary

Small explosion on stellar surface causes nova (star suddenly becomes bright). The explosion is caused by the material falling from a companion star. Two types of supernova (type i and type ii) All stars roughly formed around the same time so they all have the same age. The brightness of a star depends on both distance and luminosity. Amount of power a star radiates (energy per second = watts) Amount of starlight that reaches earth (energy per second per square meter) Is the apparent shift in position of a nearby object against a background of more distant objects. Because the earth orbits around the sun every year, the direction of a star changes with season. Nearly all o(cid:271)je(cid:272)ts e(cid:373)it ther(cid:373)al radiatio(cid:374), i(cid:374)(cid:272)ludi(cid:374)g stars, pla(cid:374)ets, you . An object"s thermal radiation spectrum depends on only one property: its temperature. Emit more light at all frequencies per unit area.