Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Question
Chapter 13, Problem 9P
To determine
The radius of Sirius compared to the Sun, and Earth.
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A star has a luminosity (power output) of 9.2x1026 W and a diameter of 6.1x108 m. What is its surface temperature? (Give your answer in SI units and include the units in your answer.)
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Round off the answer to 2 decimal places with scientific representation.
Chapter 13 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
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- A G2 star has a luminosity 100 times that of the Sun. What kind of star is it? How does its radius compare with that of the Sun?arrow_forwardHow does this radius of Sirius B compare with that of Earth?arrow_forwardA star begins its life with a mass of 5 MSunbut ends its life as a white dwarf with a mass of 0.8 MSun. List the stages in the star’s life during which it most likely lost some of the mass it started with. How did mass loss occur in each stage?arrow_forward
- Show that if two stars of the same luminosity form a close binary pair, the magnitude apparent light of the pair measured together is about 0.75 magnitudes brighter than any of the individual stars.arrow_forwardIn the laboratory, the Balmer alpha line has a wavelength of 656.3 nm. If the line in a star’s spectrum appears at 655.8 nm, what is the star’s radial velocity? Is it approaching or receding? (c = 2.997 X 108 m/s)arrow_forwardIn a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm. If the line appears in a star's spectrum at 486.7 nm, what is the star's radial velocity (in km/s)? (Enter the magnitude.) km/sarrow_forward
- A star with a radius three times that of the Sun and a surface temperature twice that of the Sun, will have a luminosity _______ times as great as the Sun's luminosity.arrow_forwardA star has a peak output at 440 nm and has a luminosity of 3 solar luminosities. What is its radius? (LS=3.826 X 1026 J/s)arrow_forwardTwo stars of the same diameter or observed to have surface temperatures of 4000 Kelvin and 16,000 Kelvin. Which star is probably the brighter of the two? How many times brighter?arrow_forward
- What measurements would you make (assuming you have the money, time, & equipment) to determine a star’s surface temperature?arrow_forwardWhich of the following stars has the highest surface temperature? Treat the star as a blackbody. a)A dim red star b)A bright red star c)A bright orange star d)A dim orange star e)A bright yellow stararrow_forward
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