PPT-Brightnesses

sizes and motions of stars Recap Project due Friday 1121 Campus observatory Information from brightnesses of stars Brightness depends on distance temperature and size If you know two of these brightness can be used to give you the third. Integral surface brightnesses Stellar counts are one of the main tools in any study of the structure of our Galaxy However the use of stellar counts is connected with certain di64259culties both of principal and practical nature In particular this Thermal Spectra. Emission . and Absorption Spectra. Recap. Campus observatory. Project . due 11/22. Continuous . emission and colors of . objects. Why do dense objects produce continuous emission?. Temperature as a measure of average speed of atoms in a material. , sizes and motions of stars . Recap. Canvas assignment due Friday. Project. : due . Friday 11/21. Campus . observatory. Emission . and absorption lines. Arise from low density gases, where structure of atoms becomes important. Emission . and Absorption Spectra. Recap. Canvas homework due . FRIDAY. Lab this week: the . Hertzsprung. -Russell diagram (unfortunately, getting here a little ahead of class!). Project due 11/. 22: see information from Canvas home page (. Yes. No. I’m not sure.. Not a complete circuit . QuickCheck 28.1. Yes. No. I’m not sure.. Does the bulb light? . The three bulbs are identical and the two batteries are identical. Compare the brightnesses of the bulbs. .