times brighter than another star, how many magnitudes brighter is it?
To work this problem, you must refer to Table 2-1 in the text. If one star is 6.3 times brighter than another star, the intensity ratio of the two stars is 6.3. Reading the table tells us that, [ANSWER: The difference in magnitudes is 2. The brighter star is two magnitudes lower (brighter) than the fainter star.] 3. If two stars differ by 7 magnitudes, what is their intensity ratio? To work this problem, you must refer to Table 2-1 in the text. If the magnitude difference is 7, reading the table tells us that, [ANSWER: The intensity ratio is 630.] 6. If star A is magnitude 4 and star B is magnitude 9.6, which is brighter and by what factor? This problem cannot be solved simply by looking at the tables, you must use the formula on page 14: (IA / IB) = (2.512)(mB – mA) The magnitudes are mA = 4 and mB = 9.6. Star A is brighter because it has a lower magnitude. The magnitude difference is mB – mA = 5.6. The intensity ratio is thus: (IA / IB) = (2.512)5.6 = 170 [ANSWER: The intensity ratio
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