AS101 - Assignment #9 Questions and Answers 100% Pass

AS101 - Assignment #9 Questions and Answers 100% Pass Who first noticed that for Cepheid variable stars there was a direct relationship between the luminosity and the period of the variation in their brightness? a. Henrietta Leavitt b. Harlow Shapley c. Annie Cannon d. Edwin Hubble - a Who first calibrated the Cephied variable stars for use in determining distance? a. Carl Sagan b. Henrietta Leavitt c. Harlow Shapley d. Edwin Hubble - c 2 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. Refer to the figure. A Type II Cephied with a period of 10 days has been located in a distant globular cluster. What is the star's absolute magnitude? a. -1 b. 0 c. -4 d. -6 - a Refer to the figure. A Type II Cephied with a period of 30 days has been located in a distant globular cluster. What is the star's absolute magnitude? a. -2 b. 0 c. -6 d. -5 - a Refer to the figure. Polaris is a Type I Cepheid with a period of 4 days. What is its absolute magnitude? a. 0 3 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. b. +1 c. -3.5 d. -1 - c Refer to the figure. If you observe the period of a type II Cepheid and mistakenly think it's a type I Cephied, what incorrect conclusion will you draw? a. You will think the Cepheid is farther away than it actually is b. You will measure the wrong period c. You will think the Cepheid is less luminous than it actually is d. You will think the Cepheid is closer than it actually is - a Refer to the figure. A type I Cepheid with a period of 20 days has been located in a distant globular cluster. What is its absolute magnitude? a. 0 b. -1 c. -2 d. -5 - d 4 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. Refer to the figure. Why is it more difficult to measure the distances to globular clusters (which contain RR Lyrae stars) than the distances to open clusters (which contain Cephieds)? a. RR Lyrae stars pulsate so fast that they can't be measured b. RR Lyrae stars do not have a relationship between period and luminosity c. RR Lyrae stars are further away than Cepheids d. RR Lyrae stars are dimmer and harder to see - d What happens with stars when they enter the instability strip? a. They become unstable and pulsate as variable stars b. They become unstable and produce bursts of X-rays c. They become unstable and turn into fast rotating dwarfs d. They become unstable and vibrate at variable speeds - a How did Harlow Shapley use the period-lumino