AST201H1 Midterm: Midterm 2 Review Questions with Answers

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Stefan Mochnacki

Document Summary

Midterm 2 review questions diameter: 100 000 lie and it has around 200 billion stars distance between central bulge and sun: 28 000 light years away (around 2/3 from the centre) Apparent brightness-tells us how much fusion is going on in the star. To calculate distance ^2 dimmer by that much. 10au= 100, 1au= 1 so the solar panel at 10au would receive 1/20 the energy compared to if it were at 1au or it"s dimmer by 20watts per meter squared luminosity depends on temperature and radius. in h-r diagram, most luminous are higher up. brightest in relation to radius blue stars: higher luminosity types of binary star systems: spectroscopic (doppler shifts), visual (telescopes) and eclipsing (eclipses and diff. in amount of light emitted) most commonly used is eclipsing because it"s useful in estimating size, density, luminosity and distance (can measure distance to other galaxies) Has an error factor of less than 5%