Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 19, Problem 4E
Which method would you use to obtain the distance to each of the following?
A. An asteroid crossing Earth’s orbit
B. A star astronomers believe to be no more than 50 light-years from the Sun
C. A tight group of stars in the Milky Way Galaxy that includes a significant number of variable stars
D. A star that is not variable but for which you can obtain a clearly defined spectrum
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Apparent and Absolute Magnitude of Stars Participation Exercise
Adapted from Lecture Tutorials for Introductory Astronomy workbook
1. What is the term that defines how bright an object actually is?
2. What is the term that defines how bright an object appears to be?
3. Comparing Saturn's apparent magnitude of -0.55 to Jupiter's apparent
magnitude of -2.2,
a. Which object appears brighter from Earth? How do you know?
b. Give an apparent magnitude value of an object that is brighter than
both Saturn and Jupiter.
4. If the Lady Gaga star has an apparent magnitude of 0.03 and is located
7.8 parsecs away from Earth, which of these values would be the most
likely absolute magnitude? State your answer and explain your
reasoning for your answer below the choices.
a. -1.12
b. 0.03
c. 0.58
You will use the chart below to answer the following questions:
Star Apparent Magnitude Absolute Magnitude
A 4 5
B 2 0
C -2 -2
D 3 2
a. Which star appears brighter from Earth: Star A or Star B? Explain your…
3. Name the 2 astronomers that discovered these relationships (star's luminosity, temperature, absolute magnitude and spectral class)
Hubble’s Field of View. Large telescopes often have small fields of view. For example, the Hubble Space Telescope’s (HST’s) advanced camera has a field of view that is roughly square and about 0.06° on a side.
a. Calculate the angular area of the HST’s field of view in square degrees.
b. The angular area of the entire sky is about 41,250 square degrees. How many pictures would the HST have to take with its camera to obtain a complete picture of the entire sky?
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Name five characteristics of a star that can be determined by measuring its spectrum. Explain how you would use a spectrum to determine these characteristics.arrow_forwardExplain what dispersion is and how astronomers use this phenomenon to study a star’s light.arrow_forward1. The relative velocities of four stars are shown in the figure below with arrows. If an astronomer were to study the light from these four stars, in which star would the astronomer see greatest redshift of its light spectra? Hint: Think Doppler Effect A. star 1B. star 2C. star 3D. star 4arrow_forward
- How do you create a three dimensional light source ? (Sun, Star, Fire, Flashlight, candle, Light bulb, etc.)arrow_forward(subject: astronomy) 1. When do you say a star is very hot compared to the red. 2. are stars of equal size? explain your answerarrow_forwardWhat are the different models of light ?explainarrow_forward
- 4. List the seven main classes of stars, from hottest to coolest.arrow_forwardYou have enough information from this chapter to estimate the distance to Alpha Centauri, the second nearest star, which has an apparent magnitude of 0. Since it is a G2 star, like the Sun, assume it has the same luminosity as the Sun and the difference in magnitudes is a result only of the difference in distance. Estimate how far away Alpha Centauri is. Describe the necessary steps in words and then do the calculation. (As we will learn in the Celestial Distances chapter, this method-namely, assuming that stars with identical spectral types emit the same amount of energy-is actually used to estimate distances to stars.) If you assume the distance to the Sun is in AU, your answer will come out in AU.arrow_forward
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