UNIVERSE (LOOSELEAF):STARS+GALAXIES
6th Edition
ISBN: 9781319115043
Author: Freedman
Publisher: MAC HIGHER
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Chapter 23, Problem 54Q
To determine
The accuracy of the statement saying “The Sun is the only star in our galaxy and all of the other stars in the sky are located in other galaxies.”
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Students have asked these similar questions
A distant galaxy has an apparent magnitude of 13 and is 5,000 kpc away. What is its absolute magnitude? (Round your answer to at least one decimal place.)
The difference in absolute magnitude between two objects viewed from the same distance is related to their fluxes by the flux-magnitude relation.
FA
= 2.51(MB - MA)
FB
How does the absolute magnitude of this galaxy compare to the Milky Way (M = -21)?
F,
distant galaxy
FMilky Way
Distance 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?
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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 sdT
The star Sirius has an apparent magnitude of -1.46 and appears 95-times brighter compared tothe more distant star Tau Ceti, which has an absolute magnitude of 5.69.(a) Explain the terms apparent magnitude, absolute magnitude and bolometric magnitude.(b) Calculate the apparent magnitude of the star Tau Ceti.(c) Find the distance between the Earth and Tau Ceti.www.
Chapter 23 Solutions
UNIVERSE (LOOSELEAF):STARS+GALAXIES
Ch. 23 - Prob. 1QCh. 23 - Prob. 2QCh. 23 - Prob. 3QCh. 23 - Prob. 4QCh. 23 - Prob. 5QCh. 23 - Prob. 6QCh. 23 - Prob. 7QCh. 23 - Prob. 8QCh. 23 - Prob. 9QCh. 23 - Prob. 10Q
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- Earth is about 150 million kilometers from the Sun (1 Astronomical Unit, or AU), and the apparent brightness of the Sun in our sky is about 1300 watts/m^2. Using these two facts and the inverse square law for light, determine the apparent brightness that we would measure for the Sun if we were located at the following positions. a) At the orbit of Venus (67 million km from the Sun). b) At the orbit of Jupiter (780 million km from the Sun). c) At the mean distance of Pluto (40 Astronomical Units).arrow_forwarda) Calculate the period of the solar system's orbit around the Milky Way. Assume that we are 8.5 kpc from the galactic center and assume that the mass of the Milky Way interior to our orbit is ~ 10¹¹ solar masses. Alpha Centauri is a multiple star system only 1.34 parsecs away. The apparent magnitudes of the two main stars are: a Cen A: my = +0.01; a Cen B: my = +1.33. b) Calculate the ratio of the flux we receive in the V filter from a Cen A to the flux we receive from a Cen B. c) Calculate the absolute magnitude My of a Cen B.arrow_forwardLet’s say you’re looking for extrasolar planets. You observe a star that has a spectral shift in the line that is supposed to be at at 656.28011 nm – this star shows this line at 656.28005 nm. What is the radial velocity of star (in m/s) and in what direction in relation to you? a) 27.4 m/s, towards b) 27.4 km/s, away c) -27.4 m/s, toward d) -27.4 km/s, awayarrow_forward
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