Stellar Physics - 1. This question is about the nature of...

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Unformatted text preview: 1. This question is about the nature of certain stars on the Hertzsprung-Russell diagram and determining stellar distance. The diagram below shows the grid of a Hertzsprung-Russell (H-R) diagram on which the positions of the Sun and four other stars A, B, C and D are shown. 10 10 1 10 10 10 10 4 2 2 4 6 6 25000 10000 8000 6000 5000 4000 3000 Surface temperature ( / K) T A B C D Sun Luminosity ( ) (Sun = 1) L L (a) State an alternative labelling of the axes, (i) x-axis ................................................................................................................. (1) (ii) y-axis ................................................................................................................. (1) 1 (b) Complete the table below. Star Type of star A B C D (4) (c) Explain, using information from the H-R diagram, and without making any calculations, how astronomers can deduce that star B is larger than star A . ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (3) (d) Using the following data and information from the H-R diagram, show that star B is at a distance of about 700 pc from Earth. Apparent visual brightness of the Sun = 1.4 10 3 W m 2 Apparent visual brightness of star B = 7.0 10 8 W m 2 Mean distance of the Sun from Earth = 1.0 AU 1 parsec = 2.1 10 5 AU ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (4) 2 (e) Explain why the distance of star B from Earth cannot be determined by the method of stellar parallax. ........................................................................................................................................
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This note was uploaded on 09/21/2009 for the course PHYSICS 2211 taught by Professor Uzer during the Fall '08 term at Georgia Institute of Technology.

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Stellar Physics - 1. This question is about the nature of...

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