ASTR 114 Lecture Notes - Lecture 29: Stellar Kinematics, Proper Motion, Red Supergiant Star
10 Jan 2020
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Document Summary
Luminosity of sun"s photosphere is equal to the energy per second generated by sun"s nuclear reactions. Spectral type temp and color all describe some characteristic of a star t. Stars have same luminosity but x if spectral type f and y is k. x is larger than y f. A and b same temp but b is 20 time smaller than a: a and b same color but a is brighter. Proton proton cycle he and neutrino lose mass converted to energy. To turn proper motion to space velocity we need mass and spectral type. Sun and earth separated by 10 now the flux of sunlight would be 100 times less. O is hotter than sun therefore its emission peaks in the blue part of spectrum. The corona is superheated and radiates x rays with a peak wavelength of 0. 2nm. temp of this region of the corona:15*10^6. Hydrostatics in our sun balance: gravitation and press.
