Astro 210 Homework 9

# Astro 210 Homework 9 - Astronomy 210 Homework Set#9 Due in...

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Astronomy 210 Homework Set #9 Due in class: Friday, April 15 Total Points: 50 + 5 bonus 1. How far can the eye see? The human eye can see a star, under ideal conditions, as dim as an apparent visual magnitude m lim 6. (a) [5 points] If a star has absolute magnitude M , show that the distance d lim (in parsecs) at which its apparent magnitude is m lim is given by d lim = 10 1+( m lim M ) / 5 pc (1) (b) [5 points] Using this, ±nd the maximum distance d max , in parsecs, from which your naked eye can see a star: i. with absolute magnitude the same as the Sun, M = 4 . 83 ii. with the absolute magnitude of the most luminous star–that is, the one with the largest negative absolute magnitude–found in James Kaler’s table of the brightest stars in the sky, available via the course links page iii. with the absolute magnitude of the least luminous star–that is, the one with the largest positive absolute magnitude–found in the RECONS table of the nearest stars, available via the course links page Compare these results with the distance to the nearest star, and comment. (c) [5 points] Finally, comment on any possible bias that might a²ect the distribution of stars visible to the naked eye. 2.

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## This note was uploaded on 10/06/2011 for the course ASTRO 210 taught by Professor Fields during the Spring '08 term at University of Illinois, Urbana Champaign.

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Astro 210 Homework 9 - Astronomy 210 Homework Set#9 Due in...

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