UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 19, Problem 25Q
To determine
The ways by which using the H-R diagrams one can set limits on the age of the universe. Also, find out whether the H-R diagram can be used to set upper limits or lower limits.
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How is the turnoff point on the H-R diagram of a cluster related to the cluster’s age?
If an open cluster contains 650 stars and is 27 pc in diameter, what is the average distance between the stars? (Hint: On average, what share of the volume of the cluster surrounds each star?)
If you assume that a globular cluster 4 arc minutes in diameter is actually 27 pc in diameter, how far away is it? (Hint: Use the small-angle formula.)
___ kpc
Chapter 19 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
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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_forwardH II regions can exist only if there is a nearby star hot enough to ionize hydrogen. Hydrogen is ionized only by radiation with wavelengths shorter than 91.2 nm. What is the temperature of a star that emits its maximum energy at 91.2 nm? (Use Wien’s law from Radiation and Spectra.) Based on this result, what are the spectral types of those stars likely to provide enough energy to produce H II regions?arrow_forwardSuppose a star cluster were at such a large distance that it appeared as an unresolved spot of light through the telescope. What would you expect the overall color of the spot to be if it were the image of the cluster immediately after it was formed? How would the color differ after 1010 years? Why?arrow_forward
- Using a Hertzsprung–Russell diagram to illustrate your answer, describe in detail the followingmain stages of a solar mass star’s evolutionary track. You should briefly describe the importantphysical process/processes at each stage, and one or two observational facts.• protostar• main-sequence• post-main-sequencearrow_forwardif the stars at the turnoff point in a star cluster have masses of about 9 M⊙, how old is the cluster (in yr)? (Hint: refer to the stellar life expectancies equation.)arrow_forwardCalculate the proper motion (in arc seconds per year) of a globular cluster with a transverse velocity (relative to the Sun) of 220 km/s and a distance of 2 kpc. Do you think that this motion is measurable?arrow_forward
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