Pad * 84% - 8:07 PM instructure-uploads,s3.amazonaws.com 118 H-R Diagram 4) Whic
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Pad * 84% - 8:07 PM instructure-uploads,s3.amazonaws.com 118 H-R Diagram 4) Which two pairs of labeled stars have the same luminosity? 5) Do stars with the same luminosity have the same absolute magnitude number? Use a pair of stars from your answer to Question 4 to support your answer 6) If two stars have the same absolute magnitude number, do they necessarily have the same temperature? Use a pair of stars from the H-R diagram on the previous page to support your answer 7) Stars of the same spectral type have the same (circle one) absolute magnitude number temperature luminosity 8) Stars of the same absolute magnitude number have the same (circle one) spectral type temperature luminosity 9) For each of the following star descriptions, state whether the star would be a red giant, white dwarf, or main sequence star, and provide the letter(s) of a star from the H-R diagram that fits each description a) very bright (high luminosity) and very hot (high temperature) b) very dim and cool c) very dim and very hot d) very bright and cool LECTURE-TUTORIALS FOR INTRODUCTORY ASTRONOMY HIRD EDITION 2013 Pearson Education, Inc.Explanation / Answer
4, Blue Giants and Red Supergiants have the same luminosity although they have different temperatures. Luminosity is the total amount of energy that a stars radiates in 1 second. This is illustrated in the H-R Diagram or the Hertzsprung Russell Diagram. They have luminosity in the range 104 to 106 L.
5. Blue Giants and Red Supergiants have the same absolute magnitude number. This is because absolute magnitude is a measure of how bright a sun is. It is depicted in the vertical axis just opposite to the luminosity axis of the H-R Diagram which is also a vertical axis.
6. If 2 stars have the same absolute magnitude number, they need not have the same temperature. This is because, temperature is shown on the x axis while absolute magnitude is shown on the y axis in the H-R Diagram. For example, Blue Giants and Red Supergiants have the same absolute magnitude numbers but they have different temperatures: Temperature of Blue Giants is more than that of Red Supergiants. The absp;ute temperature is measured in Kelvins and increases to the right in this diagram.
7. Stars of the same spectral type have the same- Temperature.
8. Stars of the same absolute magnitude have the same - Luminosity.
9. a. Very bright and very hot - Blue Giants
b. Very dim and cool - Main sequence (A)
c. Very dim and very hot - White dwarfs (D)
d. Very bright and cool - Red Giants and Red Supergiants (C and B)
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