Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 19, Problem 19E
A star has a temperature of 10,000 K and a luminosity of
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Chapter 19 Solutions
Astronomy
Ch. 19 - Explain how parallax measurements can be used to...Ch. 19 - Suppose you have discovered a new cepheid variable...Ch. 19 - Explain how you would use the spectrum of a star...Ch. 19 - Which method would you use to obtain the distance...Ch. 19 - What are the luminosity class and spectral type of...Ch. 19 - The meter was redefined as a reference to Earth,...Ch. 19 - While a meter is the fundamental unit of length,...Ch. 19 - Most distances in the Galaxy are measured in...Ch. 19 - The AU is defined as the average distance between...Ch. 19 - What would be the advantage of making parallax...
Ch. 19 - Parallaxes are measured in fractions of an...Ch. 19 - For centuries, astronomers wondered whether comets...Ch. 19 - The Sun is much closer to Earth than are the...Ch. 19 - Parallaxes of stars are sometimes measured...Ch. 19 - Estimating the luminosity class of an M star is...Ch. 19 - Figure 19.9 is the light curve for the prototype...Ch. 19 - Which of the following can you determine about a...Ch. 19 - A G2 star has a luminosity 100 times that of the...Ch. 19 - A star has a temperature of 10,000 K and a...Ch. 19 - What is the advantage of measuring a parallax...Ch. 19 - What is the disadvantage of the parallax method,...Ch. 19 - Luhman 16 and WISE 0720 are brown dwarfs, also...Ch. 19 - Most stars close to the Sun are red dwarfs. What...Ch. 19 - Why would it be easier to measure the...Ch. 19 - When Henrietta Leavitt discovered the...Ch. 19 - A radar astronomer who is new at the job claims...Ch. 19 - The New Horizons probe flew past Pluto in July...Ch. 19 - Estimate the maximum and minimum time it takes a...Ch. 19 - The Apollo program (not the lunar missions with...Ch. 19 - In 1974, the Arecibo Radio telescope in Puerto...Ch. 19 - Demonstrate that 1 pc equals 3.091013 k m and that...Ch. 19 - The best parallaxes obtained with Hipparcos have...Ch. 19 - Astronomers are always making comparisons between...Ch. 19 - Gaia will have greatly improved precision over the...Ch. 19 - Using the same techniques as used in Exercise...Ch. 19 - The human eye is capable of an angular resolution...Ch. 19 - How much better is the resolution of the Gaia...Ch. 19 - The most recently discovered system close to Earth...Ch. 19 - What would the parallax of Luhman 16 (see Exercise...Ch. 19 - The New Horizons probe that passed by Pluto during...Ch. 19 - What physical properties are different for an M...
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- What are the luminosity class and spectral type of a star with an effective temperature of 5000 K and a luminosity of 100 LSun?arrow_forwardThe lowest mass for a true star is 1/12 the mass of the Sun. What is the luminosity of such a star based upon the mass-luminosity relationship?arrow_forwardThe star Betelgeuse has a temperature of 3400 K and a luminosity of 13,200 LSun. Calculate the radius of Betelgeuse relative to the Sun.arrow_forward
- A star has a radius of 2.6 R⊙, and a temperature of 9,758 K. What is the luminosity of this star (answer in solar luminosity units L⊙). [HINT: the temperature of the Sun is about 5800 K]arrow_forwardWhat type of star has the longest life span? a. O b. K c. B d. A e. Marrow_forwardA newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a radius of ~1.2x106 km?arrow_forward
- Which main-sequence star would be the least luminous? a. A b. B c. F d. G e. Karrow_forwardWhat is the size of a star with a temperature three times as hot as the sun and the luminosity of 100 suns? (L=R^2T^4)arrow_forwardA red giant star has a temperature of 3900 K and a luminosity of 13600 LSun. How many times bigger is this star than the Sun?arrow_forward
- What is the temperature of a star emitting light with a peak wavelength of 7,080 angstroms? T= ____ X 10 ___ karrow_forwardWhich star is more luminous? (you only have one try for this problem) A) A star with absolute magnitude 12 B) A star with absolute magnitude -2 How many times more luminous is it?arrow_forwardWhat did you calculate for the radius of the star that had a temperature of 5880 degrees Kelvin and a luminosity of 78 ?arrow_forward
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