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Dainsie · 07-15-2005, 04:32 AM

Quote:

Originally Posted by Dru

Dru puts up her hand. "Astronomers determine the spectral type of a star by passing the star’s light through an instrument called a spectroscope. "

Any more disruptions to my class and I will start taking off points!

Thats correct, 2 points.

Effectinve temperature - Every star varies in temperature from that of the core, the temperature of which is measured in the millions of degrees, to that of the atmosphere that is relatively cool. For example, the Sun's core reaches 15 million degrees C, while its outer layer is about 5800° C. Astronomers determine the temperature of a star's surface by comparing its spectrum with that of a black body (a theoretical body that perfectly absorbs all the radiation striking it). Scientists know how to correlate a black body spectrum with its temperature. From the known temperature of the black body spectrum that agrees most closely with the star's spectrum, astronomers can determine the star's surface temperature.

Size and mass really don't need an explanation, but what does chemical composition mean?

07-15-2005, 04:32 AM	#71 (permalink)
Dainsie Blast-Ended Skrewt Join Date: Sep 2002 Location: Exploring Posts: 16,056	T l Guitar ♥ l l Bed Police l S Quote: Originally Posted by Dru Dru puts up her hand. "Astronomers determine the spectral type of a star by passing the star’s light through an instrument called a spectroscope. " Any more disruptions to my class and I will start taking off points! Thats correct, 2 points. Effectinve temperature - Every star varies in temperature from that of the core, the temperature of which is measured in the millions of degrees, to that of the atmosphere that is relatively cool. For example, the Sun's core reaches 15 million degrees C, while its outer layer is about 5800° C. Astronomers determine the temperature of a star's surface by comparing its spectrum with that of a black body (a theoretical body that perfectly absorbs all the radiation striking it). Scientists know how to correlate a black body spectrum with its temperature. From the known temperature of the black body spectrum that agrees most closely with the star's spectrum, astronomers can determine the star's surface temperature. Size and mass really don't need an explanation, but what does chemical composition mean?