CAS AS 102 Lecture : Astronomy 102 October 4th.docx

• School: Boston University
• Department: Astronomy
• Course: CAS AS 102
• Professor: Merav Opher

Document Summary

Midterm on chapters 1, 2, 3, 4, 5, and 13, up to page 403. Brightness= total light emitted per second/area of a sphere of radius. Brightness= total light emitted per second /4*pi*d^2 d= distance to the star. Luminosity is the total energy emitted per second from a star. Brightness is the rate at which we receive that energy (depends on an observer"s perspective) Most stars are less luminous than the sun. Measure the peak of the bell curve created through wein"s law.