Feb16 - Betelgeuse 41,000L! 3100K 700R! 427 ly Bellatrix...

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Rigel 70,000 ! 11,000K 70R ! 773 ly Betelgeuse 41,000L ! 3100K 700R ! 427 ly Bellatrix 6,400L ! 21,500K 6R ! 240 ly IMAGING BETELGEUSE WITH HST
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" max = 0.0029 T Wein’s Law: • Stars can appear red because: " They are cool " They are reddened by dust (recall reddening of sunsets) # Doppler effect - too small to visibly affect color – Distant galaxies do appear red because of the Doppler effect. No stars in our own galaxy are moving fast enough for that. • Stars can appear blue because: " They are hot # Doppler effect - too small STAR COLOR CAUSES:
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Temperature (K) Color of ! max Spectral Class Below 1300 Infrared T 1300-2500 Far red L 2500-3900 Red-orange M 3900-5200 Orange-yellow K 5200-5900 Green G 5900-7500 Blue-violet F 7500-11,000 Ultraviolet A 11,000-30,000K Far UV B 30,000-50,000K Very-far UV O •Also subclasses - e.g. G0, G1,… G9 – The Sun is a G2 star – Mnemonic ‘ O h B e A F ine G irl/Guy, K iss M e’ – Can you extend the mnemonic for L and T? Note: perceived
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This note was uploaded on 02/25/2011 for the course ASTR 1102 taught by Professor Staff during the Spring '08 term at LSU.

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Feb16 - Betelgeuse 41,000L! 3100K 700R! 427 ly Bellatrix...

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