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 colors are different from color-of- ! max STELLAR SPECTRAL CLASSIFICATION Kirchhoff’s 3rd Law
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