midterm2-11f-solns - SHORT ANSWER. Answer the question(s),...

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SHORT ANSWER. Answer the question(s), showing the work of any calculations needed. 39) (6 points ) Consider a main sequence star with a mass of 20 Msun. a. About what is the star's luminosity, in units of Lsun? b. About how long will the star live on the main sequence? c. BrieFy state the ±nal fate of such a star, including the type of stellar remnant it will leave behind. 39) 40) (4 points) A star with a parallax of 0.02 arcsec is observed to have a companion star at a separation of 2 arcsec. a. What is the star's distance, in parsec? b. What is the physical separation between the star and it's companion star, in AU? 40) 7
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points) Star A is a solar "twin" (with same Mass, Radius, etc. as the Sun), but has a parallax of 0.1 arcsec. Star B has the same apparent brightness and color as A, but a parallax of 0.02 arcsec. a. What are the distances of A and B, in parsec (pc)? b. What is the luminosity of star B, in units of Lsun? c.
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midterm2-11f-solns - SHORT ANSWER. Answer the question(s),...

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