Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 75Q
To determine
The need for astronomers to see both stars in a binary Steller system separated on the sky as they orbit each other to determine the relative sizes of two stars by eclipsing binary method.
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Consider two stars with mV = 2.2 and mV = −1.5. What is their combined visual magnitude? Commenton whether your answer is plausible.
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Chapter 17 Solutions
Universe: Stars And Galaxies
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- Describe two ways of determining the diameter of a star.arrow_forwardDo stars that look brighter in the sky have larger or smaller magnitudes than fainter stars?arrow_forwardStar A and Star B have different apparent brightnesses but identical luminosities. Star A is 10 light-years away from Earth and appears 36 times brighter than Star B. How far away is Star B?arrow_forward
- You measure a star to have a parallax angle of 0.12 arc-seconds What is the distance to this star in parsecs? 8.33 Hint: d = 1/p 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_forwardConsider 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?arrow_forwardDistance from Apparent Brightness (rank; brightest, 8 = dimmest) Name of Star Earth (light years) | 1 = Sun Sirius 8.6 Canopus Arcturus 309 3. 36.7 4 Rigel Vega Alpha Centauri Bernard's Star 773 5 25.3 4.3 7 5.9 8 13 What sentence explains why a star can be much farther from Earth than the Sun, but still be bright? nida nenv A. Distance from Earth and apparent brightness are related. B. Bright stars that are farther away are larger than the Sun. C. The higher it appears in the sky, the brighter the star. D. The apparent brightness scale goes up as stars get dimmer. del sdTarrow_forward
- Which 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_forwardA star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the distance to this star? [Answer in parsecs] 37 What is the absolute magnitude of this star? 1.8 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) M What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.)arrow_forwardConsider 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. )arrow_forward
- (a) The figure shows the three stars and their velocities. Which star has the largest proper motion? Which star has the smallest proper motion? A B Eartharrow_forwardListed below are several fictional stars with their luminosities and distances from Earth given. Rank the stars based on how bright each would appear in the sky as seen from Earth, from brightest to dimmest. A) Q-bert: L=400Lsun, d=40lyB) Frogger: L=400Lsun, d=20lyC) Centipede: L=200Lsun, d=10lyD) Galaga: L=100Lsun, d=8lyE) Pacman: L=200Lsun, d=20lyarrow_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
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