21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 40QP
To determine
The Sun’s luminosity.
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Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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- A star is observed to be thrice the size of the Sun with temperature of 1.3Tsun. Estimate its luminosity.arrow_forwardThe nearest star to the Sun is Proxima Centauri, a red dwarf star at a distance of 4.243 ly. Its surfacetemperature is estimated to 3042 K and its apparent magnitude is mbol = 7.77. What is the absolutemagnitude of Proxima Centauri?arrow_forwardBarnard’s star is an orange star in the constellation Ophiuchus. It has the largest known proper motion (10.3577"/yr) and the fourth-largest parallax angle (0.54901"). In the spectrum of this star, the H alpha line is observed to have a wavelength of 656.034 nm when measured from the ground. a. Determine the radial velocity of Barnard’s star. b. Determine the transverse velocity of Barnard’s star. c. Calculate the speed of Barnard’s star through space.arrow_forward
- To find the Sun’s luminosity from its brightness using the inverse-square law, you also had to be given the distance from the Earth to the Sun. Carefully describe the steps in a process that would allow you to measure the distance to the Sun.arrow_forwardYou have taken the spectrum of a star with a peak wavelength at 389 nm. You have determined the radius of the star to be 3.3 solar radii. What is the star’s luminosity, in solar units?arrow_forwardCalculate the luminosity of the star with an apparent magnitude of 2. Given the Sun has an apparent magnitude of -26.57 and 3.9 × 1026 W luminosity.arrow_forward
- A star with a radius twice that of the Sun and a surface temperature twice that of the Sun, will have a luminosity times as great as the Sun's luminosity. A. 4 B. 9 O C. 16 D. 64 O E. 144arrow_forward20. A star is an example of a true blackbody. True Falsearrow_forwardThe luminosity of the Sun is 3.83 × 1026 W. This energy comes from fusion during which some matter is turned into energy. How many tons of matter are destroyed each second to maintain this luminosity? Bear in mind that 1 ton has a mass of 907 kg and that 1 W = 1 J/s. Amount of matter destroyed each second = _____ tonsarrow_forward
- "51 Pegasi" is the name of the first normal star (besides the Sun) around which a planet was discovered. It is in the constellation Pegasus the horse. Its parallax is measured to be 0.064 arcsec. a. What is its distance from us? b. The apparent brightness is 1.79 × 10-10 J/(s·m2 ). What is the luminosity? How does that compare with that of the Sun? Look up the temperature: how doarrow_forward= A star population is composed of stars with masses in the range between 1M and 150M. The initial mass function is = 0 (M/M)-2.3, where o (Mo). The luminosity of a star = (M/M) 3.3. Calculate the percentage of the total luminosity of the stars in the population which is produced by stars with mass between 120M and 150M. scales with its mass as L/Larrow_forwardName 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_forward
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