Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 2, Problem 2P
To determine
The magnitude difference of the two stars.
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Consider two identical stars, A and B. Star B is 10 times farther away than star A. What is the difference
in magnitudes between the two stars?
15: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the distance to this star? Answer: 37
16: What is the absolute magnitude of this star? Answer:1.8
17: Is this star more or less luminous than the Sun? Answer "M" for More luminous or "L" for Less luminous. (HINT: the absolute magnitude of the Sun is 4.8) Answer: M
18: What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.)
Please answer question #18, #15-17 are correct, the photos provide the work for them.
Consider two identical stars, A and B. Star B is 10 times farther away than star A. What is the differencein magnitudes between the two stars?
Chapter 2 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 2 - Why are most of the constellations that were...Ch. 2 - Prob. 2RQCh. 2 - Which is the asterism and which is the...Ch. 2 - Prob. 4RQCh. 2 - Prob. 5RQCh. 2 - What does the word apparent mean in apparent...Ch. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - Why doesnt a magnitude difference of one mean that...Ch. 2 - Prob. 12RQCh. 2 - In what ways is the celestial sphere a scientific...Ch. 2 - Is the precessing top shown in Figure 2-7a an...Ch. 2 - How would you define the celestial poles and...Ch. 2 - Where would you need to go on Earth to see the...Ch. 2 - Where would you go on Earth if you wanted to be...Ch. 2 - Your zenith is at your east point and your nadir...Ch. 2 - Why does the number of circumpolar constellations...Ch. 2 - Explain two reasons winter days are colder than...Ch. 2 - How does the date of the beginning of summer in...Ch. 2 - If it is the first day of spring in your...Ch. 2 - It is the first day of summer. Will the days start...Ch. 2 - How much flux from the Sun does the Northern...Ch. 2 - Why does the eccentric shape of Earths orbit make...Ch. 2 - How Do We Know? How can a scientific model be...Ch. 2 - How Do We Know? Why is astrology a pseudoscience?Ch. 2 - How Do We Know? Why must a scientific argument...Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - If two stars differ by 8 magnitudes, what is their...Ch. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - By what factor is the full moon brighter than...Ch. 2 - What is the angular distance from the north...Ch. 2 - If you are at latitude 40 degrees north of Earths...Ch. 2 - If you are at latitude 30 degrees north of Earths...Ch. 2 - How many precession periods are in one cycle of...Ch. 2 - Arrange the following in order of increasing...Ch. 2 - Arrange the following in order of increasing...Ch. 2 - Find the Big Dipper in the star trails photograph...Ch. 2 - Look at The Sky Around You, item 1a. In the...Ch. 2 - Look at the view from Earth on March 1 in Figure...Ch. 2 - Look at Figure 2-9, shown here. If you see...
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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
- Describe two ways of determining the diameter of a star.arrow_forwardExplain the origin of the magnitude designation for determining the brightness of stars. Why does it seem to go backward, with smaller numbers indicating brighter stars?arrow_forwardIs the Sun an average star? Why or why not?arrow_forward
- Do stars that look brighter in the sky have larger or smaller magnitudes than fainter stars?arrow_forwardIf we view a star now, and then view it again 6 months later, our position will have changed by the diameter of the Earth's orbit around the sun. For nearby stars (within 100 light-years or so), the change in viewing location is sufficient to make the star appear to be in a slightly different location in the sky. Half of the angle from one location to the next is known as the parallax angle (see figure). Parallax can be used to measure the distance to the star. An approximate relationship is given by d = 3.26 p , where d is the distance in light-years, and p is the parallax measured in seconds of arc. Vega is a star that has a parallax angle of 0.13 second. How far is Vega from the sun? Note: Parallax is used not only to measure stellar distances. Our binocular vision actually provides the brain with a parallax angle that it uses to estimate distances to objects we see. (Round your answer to two decimal places.) light-yearsarrow_forwardIf a star's absolute magnitude value is significantly larger than its apparent magnitude value (Mv>mv), what can you conclude about the star?arrow_forward
- What is the difference in magnitude for two stars is one appears four times brighter than the other?arrow_forwardA first-magnitude star is 100 times brighter than a sixth-magnitude star, which means each difference in magnitude represents a brightness change of 2.51 times. Compare the brightness of a star with an apparent magnitude (m) of −2.1 to a star with an apparent magnitude of +2.9.A first-magnitude star is 100 times brighter than a sixth-magnitude star, which means each difference in magnitude represents a brightness change of 2.51 times. Bchange ≈arrow_forwardAccording to the equation d=1/p, a star whose parallax angle is 1/50” is how far away?arrow_forward
- How many times dimmer is a star with magnitude +3 compared with the planet Mars with a magnitude of -1?arrow_forwardWhich of the following is least reasonable regarding the magnitude scale: Group of answer choices The numerical difference between a star's absolute and apparent magnitudes is a measure of the distance to the star. If the Sun were moved to a distance of 10 parsecs, its apparent magnitude would be about 4.8 and it would therefore not be visible to the naked eye. The fact that Sun's absolute magnitude of 4.8 is greater than the Sun's apparent magnitude of -27 implies that the Sun is a lot closer than 10 parsecs. Apparent magnitude measures a star's apparent brightness when viewed at the star's actual distance from the observer. A star's absolute magnitude is its apparent magnitude when viewed from a distance of 10 parsecs.arrow_forwardUse a diagram to explain what is meant by the parallax angle, p, for a star observed twice from Earth, with a 6-month interval between each observation. Hence define the parsec, and calculate its value in astronomical units and metres. The star Betelgeuse is observed to have a parallax angle p = 4.5 × 10−3 arcseconds. State the distance of Betelgeuse in units of parsecs and light years.arrow_forward
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