Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Question
Chapter 2, Problem 6P
To determine
The magnitude of star B and visible star.
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Consider two stars A and B, with apparent magnitudes mA = 3 and mB = 13.
Which star is brighter? (Answer this for yourself---don't enter below. This is easy if you understand the meaning of the magnitude scale.)
How much brighter (in flux) is the brighter star? (I.e., enter the appropriate multiplicative factor N, such that Fbrighter = N Fdimmer. )
Star A has an apparent magnitude of –1.5 and is 12.6 light-years from Earth. Star B has an apparent magnitude of 0.4 and is 15.6 light-years from Earth.
Why should apparent magnitude NOT be used to determine which star is brighter? What information could help you determine which star is brighter?
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?
Chapter 2 Solutions
Stars and Galaxies
Ch. 2 - Prob. 1RQCh. 2 - Prob. 2RQCh. 2 - Prob. 3RQCh. 2 - Prob. 5RQCh. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQCh. 2 - Prob. 11RQ
Ch. 2 - Prob. 13RQCh. 2 - Prob. 14RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 20RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 23RQCh. 2 - Prob. 24RQCh. 2 - Prob. 25RQCh. 2 - Prob. 26RQCh. 2 - Prob. 27RQCh. 2 - Prob. 29RQCh. 2 - All cultures on Earth named constellations. Why do...Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - What is the angular distance from the north...Ch. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Find the Big Dipper in the star trails photograph...Ch. 2 - Look at The Sky Around You, item 1a. In the...Ch. 2 - Prob. 5LLCh. 2 - Prob. 6LL
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- Star A and Star B have different apparent brightnesses but identical luminosities. If Star A is 20 light-years away from Earth and Star B is 40 light-years away from Earth, which star appears brighter and by what factor?arrow_forwardAs seen from Earth, the Sun has an apparent magnitude of about 26.7 . What is the apparent magnitude of the Sun as seen from Saturn, about 10 AU away? (Remember that one AU is the distance from Earth to the Sun and that the brightness decreases as the inverse square of the distance.) Would the Sun still be the brightest star in the sky?arrow_forwardA star is observed to cross the meridian at an elevation of 67°, as seen from an observatory at a latitude of 52° north. What is the declination of the star? What would be the declination of a star observed to transit at an elevation of 20°?arrow_forward
- Use 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_forward15: 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.arrow_forwardPlease answer them:) Hey! As you can see, there is an image wherein the question is cut of. Here is the question: Which of the following statements is CORRECT in terms of the star's absolute magnitude??arrow_forward
- Given star A with apparent visual magnitude mv = 6.5, and star B with mv = 4.4, what is the flux ratio FA/FB?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_forwardSuppose that two stars in a binary star system are separated by a distance of 80 million kilometers and are located at a distance of 160 light years from earth. What is the angular separation of the two stars? Give your answer in arcsecondsarrow_forward
- You measure a star to have a parallax angle of 0.12 arc-seconds. What fraction of a degree is this? By how many times would you have to magnify this effect for it to be visible to the human eye? (The limit of human vision is about 1 arc-minute) What is the distance to this star in parsecs? What is the distance to this star in light years What is the parallax angle of a different star that is twice as far away as the star from the previous problems? [answer in arc-seconds without including the unit]arrow_forwardThe figure below shows the radial velocity of a star plotted as a function of time over the course of 20 days. Where is the planet in its orbit around the star when the star's radial velocity is 18 km/s? How do I determine this?arrow_forwardSuppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0x10-12 watt/m?. How far away is it? Give your answer in both kilometers and light-years.arrow_forward
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