AST201H1 Study Guide - Midterm Guide: Elliptical Galaxy, Inverse-Square Law, Solar Mass

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AST201H1 Full Course Notes
AST201H1 Full Course Notes
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100, 000 light years across (diameter across) 1000 light years thick (up and down) Our sun is located about 28, 000 light years from the galactic centre: how much energy would a solar panel absorb if it were located 10. Au from the sun compared to the amount it would absorb if it were 1. Visual we can see both members of the system; this only works for nearby binaries (observe how long each orbit takes) Spectroscopic we see the doppler shift in the light from the system as the two stars orbit one another (the time it takes the spectral lines to shift back and forth) Eclipsing we see the system dim as the stars eclipse one another (the time between eclipses: given a set of stellar spectra, identify which one corresponds to a specified spectral class. Table 15. 1 (page 500-501: what information do you need to calculate a star"s luminosity? (there are multiple possible answers. )

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