Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 18, Problem 9CC
To determine
The common factor in the processes described in the chapter for the initiation of star formation in the clouds.
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The Orion Nebula is a gas-rich region in which stars are being born. The nebula is at a distance of about 1344 lyr from Earth.Suppose you observe a star in the Orion Nebula to have an apparent magnitude of 6.75. Calculate the absolute magnitudeof the star. Also calculate the luminosity of the star in units of the solar luminosity (knowing that the absolute magnitude ofthe Sun is 4.8).
______________________________ require(s) that a young hot star (T ≥ 25,000 K) be relatively nearby.
a.
Emission nebulae
b.
HI regions
c.
Molecular clouds
d.
The hot gas of the interstellar medium
e.
21-cm radiation
Which stars are associated with a planetary nebula? black holes, neutron star's, white dwarf or main sequence stars?
Chapter 18 Solutions
Universe
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- Why do nebulae near hot stars look red? Why do dust clouds near stars usually look blue?arrow_forwardIn which of these star groups would you mostly likely find the least heavy-element abundance for the stars within them: open clusters, globular clusters, or associations?arrow_forwardWhat was the average density of the star that became SN 1987A? How does it compare to the average density of Earth? The mass was 20 times that of the Sun and the radius was 41 times that of the Sun.arrow_forward
- If a contracting protostar is three times the radius of the Sun and has a temperature of only 3000 K , how luminous will it be relative to the Sun?arrow_forward. The radius of the nebula is about 0.401 light-years. The gas is expanding away from the star at a rate of about 37 kilometers/second . Considering that distance = velocity x time, calculate how long ago the gas left the star if its speed has been constant the whole time. Make sure you use consistent units for time, speed, and distance. Answer in years.arrow_forward
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