3.17 Astro 1 Section 1 Professor Brandt

3.17 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Wednesday March 17th 1999 Announcements: Lecture notes: Class 26 Review session for test Test will focus on big issues not tricky. Constellations Stars Pegasus Ursa Major Ursa Minor Polaris Bootes Arcturus Orion Betelgeuse Rigel Lyra Vega Hercules Cassiopeia Cepheus Andromeda Cygnus Cyg X-1 Auriga Canis Major Sirius Canis Minor Procyon Gemini Perseus Tarus Have spent much of the lectures in this section talking about how people get the distances to far away objects - key to understanding universe. There is one key principle for many distance determinations that I have called the "2 out of 3 principle" If you know 2 of the following 3 things you can get the other. 1 apparent brightness 2 luminosity - absolute brightness 3 distance. Have already learned about parallax - uses geometry - only good for nearby stars.
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Spectroscopic parallax - uses spectral type to get luminosity HR diagram. Use 2/3 principle to get distance - have luminosity and apparent brightness - works for stars in our region of the disk.
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