Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
16th Edition
ISBN: 9781259663895
Author: KRAUSKOPF, Konrad B.
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 18, Problem 27E
To determine
The method how the distance to a star cluster can be determined which contains Cepheid variables.
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QUESTION 10
Which of the following Cepheid variable stars would appear to be the brightest from Earth?
A Cepheid variable star that is 10,000 times as luminous as the sun.
A Cepheid variable star with a period of 10 days.
A Cepheid variable star with a period of 3 days.
There is not enough information given.
Looking for ___ pc
Question 41
.Suppose you are looking at H-R diagrams of two similar star clusters. The most luminous main
sequence stars in the Porcini cluster are much more luminous than the most luminous main
sequence stars in the Morel cluster. What can you conclude?
O the Porcini cluster is younger than the Morel cluster
O the Porcini cluster is farther away than the Morel cluster
O the Porcini cluster is lower in metallicity than the Morel cluster
O the Porcini cluster is larger in diameter than the Morel cluster
Chapter 18 Solutions
Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
Ch. 18 - Prob. 1MCCh. 18 - Prob. 2MCCh. 18 - Prob. 3MCCh. 18 - Prob. 4MCCh. 18 - Prob. 5MCCh. 18 - Prob. 6MCCh. 18 - Prob. 7MCCh. 18 - Prob. 8MCCh. 18 - Prob. 9MCCh. 18 - Prob. 10MC
Ch. 18 - Prob. 11MCCh. 18 - Prob. 12MCCh. 18 - Prob. 13MCCh. 18 - Prob. 14MCCh. 18 - Prob. 15MCCh. 18 - Prob. 16MCCh. 18 - If we know both the luminosity and brightness of a...Ch. 18 - Prob. 18MCCh. 18 - Prob. 19MCCh. 18 - Prob. 20MCCh. 18 - Prob. 21MCCh. 18 - Prob. 22MCCh. 18 - Prob. 23MCCh. 18 - Prob. 24MCCh. 18 - Prob. 25MCCh. 18 - Prob. 26MCCh. 18 - Prob. 27MCCh. 18 - Prob. 28MCCh. 18 - Prob. 29MCCh. 18 - Prob. 30MCCh. 18 - Prob. 31MCCh. 18 - Prob. 32MCCh. 18 - Prob. 33MCCh. 18 - Prob. 34MCCh. 18 - Prob. 35MCCh. 18 - Prob. 36MCCh. 18 - Prob. 37MCCh. 18 - Prob. 38MCCh. 18 - Prob. 39MCCh. 18 - Black holes are remnants of a. stars with small...Ch. 18 - Prob. 1ECh. 18 - Prob. 2ECh. 18 - Prob. 3ECh. 18 - Prob. 4ECh. 18 - Prob. 5ECh. 18 - Prob. 6ECh. 18 - Prob. 7ECh. 18 - Prob. 8ECh. 18 - Prob. 9ECh. 18 - Prob. 10ECh. 18 - Prob. 11ECh. 18 - Prob. 12ECh. 18 - Prob. 13ECh. 18 - Prob. 14ECh. 18 - Prob. 15ECh. 18 - Prob. 16ECh. 18 - Prob. 17ECh. 18 - Prob. 18ECh. 18 - Prob. 19ECh. 18 - Prob. 20ECh. 18 - Prob. 21ECh. 18 - Prob. 22ECh. 18 - Prob. 23ECh. 18 - Prob. 24ECh. 18 - Prob. 25ECh. 18 - Prob. 26ECh. 18 - Prob. 27ECh. 18 - Prob. 28ECh. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Prob. 31ECh. 18 - Prob. 32ECh. 18 - Prob. 33ECh. 18 - Prob. 34ECh. 18 - Prob. 35ECh. 18 - Prob. 36ECh. 18 - Prob. 37ECh. 18 - Prob. 38ECh. 18 - Prob. 39ECh. 18 - Prob. 40ECh. 18 - Prob. 41ECh. 18 - Prob. 42ECh. 18 - Prob. 43ECh. 18 - Prob. 44ECh. 18 - Prob. 45ECh. 18 - Prob. 46ECh. 18 - Prob. 47ECh. 18 - Prob. 48ECh. 18 - Prob. 49ECh. 18 - Prob. 50ECh. 18 - Prob. 51ECh. 18 - Prob. 52ECh. 18 - Prob. 53ECh. 18 - Prob. 54ECh. 18 - Prob. 55ECh. 18 - How large are black holes? Can any star evolve...Ch. 18 - Prob. 57ECh. 18 - Prob. 58E
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- Explain how an HR diagram of the stars in a cluster can be used to determine the age of the cluster.arrow_forwardIf the main-sequence mass lower limit is 0.08 solar mass and the brightest main-sequence stars are 1 million times more luminous than the Sun, what is the mass range along the main sequence in the figure below? (answer in solar masses)arrow_forwardwhy are Cepheid variable stars good distance indicators? What about supernovae?arrow_forward
- An O8 V star has an apparent visual magnitude of +5. Use the method of spectroscopic parallax to estimate the distance to the star (in pc). (Hints: Refer to one of the H–R diagrams in the chapter, and use the magnitude–distance formula, d = 10(mV − MV + 5)/5 where d is the distance in parsecs, mV and MV are the apparent and absolute visual magnitude respectively.)arrow_forwardThe mass-luminosity relation describes the mathematical relationship between luminosity and mass for main sequence stars. It describes how a star with a mass of 4 M⊙ would have a luminosity of ______ L⊙. If a star has a radius 1/2 that of the Sun and a temperature 4 that of the Sun, how many times higher is the star's luminosity than that of the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125) If a star has a radius 2 times larger than the Sun's and a luminosity 1/4th that of the Sun, how many times higher is the star's temperature than that of the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125) If a star has a surface temperature 2 times lower than the Sun's and a luminosity the same as the Sun, how many times larger is the star than the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125)arrow_forwardWhich of the following is least reasonable regarding the mass of stars? Group of answer choices The vast majority of stars fall into the range of 0.08 to 100 solar mass. Stars which are too small cannot sustain nuclear fusion. Stars which are excessively big are too sluggish to sustain nuclear fusion. There are more stars on the low end than on the high end of the mass spectrum. A brown dwarf has a mass just below the least massive star.arrow_forward
- 2. If Vega is apparent magnitude zero, and Deneb first magnitude, then Vega must be 2.5× hotter than Deneb. Vega is 2.5× brighter than Deneb. Vega is about 100× brighter than Deneb. Deneb is one magnitude brighter than Vega. Deneb must be a main sequence star, and Vega a giant.arrow_forwardConsider two stars on the main sequence, A and B. Star A has a mass of Мо Star B has a mass of 0.2 Мо By what factor is the luminosity of star A greater than the luminosity of star В? [Hint: use the proportionality relations for mass, luminosity, or lifetime for stars on the main sequence.]arrow_forwardPut the steps of the life cycle of a star in order. 1 [ Choose ] [ Choose ] Lighter elements are depleted and the star becomes a red giant As hydrogen is depleted, the star fuses helium atoms 3 Helium is exhausted; larger stars collapse to a white dwarf, while smaller stars become red supergiants Red supergiant makes heavier elements up to copper Star is formed from gas cloud (nebula) 4 Star converts hydrogen to helium in fusion reaction Red supergiant makes heavier elements up to iron 5 Helium is exhausted; smaller stars collapse to a white dwarf, while larger stars become red supergiants Fusion stops, and the core collapses violently, causing a supernova (star death) [ Choose ] 7. [ Choose ] 2. 6arrow_forward
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