College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
Chapter 27, Problem 12CQ
To determine
Why is the brightest star in the constellation Lyra is h bluish star and in Boötes is reddish.
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Students have asked these similar questions
The brightest star in the constellation Lyra is the bluish star Vega, whereas the brightest star in Boötes is the reddish star Arcturus. How do you account for the difference in color of the two stars?
What is the significance of the color of a star?
O The color tells how far away the star is
O The color reveals the temperature (and often the size) of the star
O The color is not scientifically important
O The color tells the relative motion of the star to Earth (toward/away)
Two stars (a and b) in a binary system have
apparent V-band magnitudes of 8.0 and 8.4
mag, and B-V colour indices of 0.3 and -0.5
mag, respectively. (a) Which star is brightest
in the V-band? (b) Which star is brightest in
the B-band? (c) Which star would appeal
bluer to the naked eye? (d) What is the ratio
of monochromatic fluxes of the stars in the
B-band? (e) What is the total apparent
magnitude of the system in the V-band
(assuming it is unresolved)?
Chapter 27 Solutions
College Physics
Ch. 27.5 - Prob. 27.1QQCh. 27.5 - Prob. 27.2QQCh. 27.5 - Prob. 27.3QQCh. 27.6 - Prob. 27.4QQCh. 27.6 - Prob. 27.5QQCh. 27 - Prob. 1CQCh. 27 - Prob. 2CQCh. 27 - Prob. 3CQCh. 27 - Prob. 4CQCh. 27 - Prob. 5CQ
Ch. 27 - Prob. 6CQCh. 27 - Prob. 7CQCh. 27 - Prob. 8CQCh. 27 - Prob. 9CQCh. 27 - Prob. 10CQCh. 27 - Prob. 11CQCh. 27 - Prob. 12CQCh. 27 - Prob. 13CQCh. 27 - Prob. 14CQCh. 27 - Prob. 15CQCh. 27 - Prob. 16CQCh. 27 - Prob. 1PCh. 27 - Prob. 2PCh. 27 - Prob. 3PCh. 27 - Prob. 4PCh. 27 - Prob. 5PCh. 27 - Prob. 6PCh. 27 - Prob. 7PCh. 27 - Prob. 8PCh. 27 - Prob. 9PCh. 27 - Prob. 10PCh. 27 - Prob. 11PCh. 27 - Prob. 12PCh. 27 - Prob. 13PCh. 27 - Prob. 14PCh. 27 - Prob. 15PCh. 27 - Prob. 16PCh. 27 - Prob. 17PCh. 27 - Prob. 18PCh. 27 - Prob. 19PCh. 27 - Prob. 20PCh. 27 - Prob. 21PCh. 27 - Prob. 22PCh. 27 - Prob. 23PCh. 27 - Prob. 24PCh. 27 - Prob. 25PCh. 27 - Prob. 26PCh. 27 - Prob. 27PCh. 27 - Prob. 28PCh. 27 - Prob. 29PCh. 27 - Prob. 30PCh. 27 - Prob. 31PCh. 27 - Prob. 32PCh. 27 - Prob. 33PCh. 27 - Prob. 34PCh. 27 - Prob. 35PCh. 27 - Prob. 36PCh. 27 - Prob. 37PCh. 27 - Prob. 38PCh. 27 - Prob. 39PCh. 27 - Prob. 40PCh. 27 - Prob. 41APCh. 27 - Prob. 42APCh. 27 - Prob. 43APCh. 27 - Prob. 44APCh. 27 - Prob. 45APCh. 27 - Prob. 46APCh. 27 - Prob. 47APCh. 27 - Prob. 48APCh. 27 - Prob. 49APCh. 27 - Prob. 50APCh. 27 - Prob. 51APCh. 27 - Prob. 52AP
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- Explain how we can deduce the temperature of a star by determining its color.arrow_forwardHertzsprung-Russell Diagram Blue or blue-white White Yellow Red-orange Red O Rigel Superglants Belekge Main Sequence Aldergran Glants SunO Alpho Contoun B Sirius B White Dwarts 50,000 20.000 10.000 Surface Temperature (C) 6,000 5.000 3,000 What is the color of the stars shown on the diagram that have the highest surface temperature? O red O yellow blue O white Brightness Increasing O O Oarrow_forwardThe surface of a star usually has the highest temperature O True O Falsearrow_forward
- The three most prominent spectral lines of hydrogen are H-α at 656 nm, H-β at 486 nm, and H-γ 434 nm. If we observe an object with H-α at a wavelength of 700 nm, what wavelength will we observe H-β and H-γ? Is the object moving toward or away from us, and how do you know? Suppose we observe another object with H-α at 585 nm. Is this object moving toward or away from us? Is it moving slower or faster than the first object?arrow_forwardA star is moving toward Earth with a radial velocity (speed directly toward or away from Earth) of 40,000 km/s. If we take a spectrum of this star’s light, will we find it to be red shifted or blue shifted? By what fraction are the wavelengths in this star’s spectrum shifted? [Answer: λ0/λ = 0.88]arrow_forward(a) The colour temperature can be determined from two magnitudes corresponding to two different wavelengths. Show that: 7000 K Te (B-V)+0.47 The wavelengths ofthe B and V bands are 440 nm and 548 nm, respectively, and we assume that B=V for stars of the spectral class A0, the colour temperature of which is about 15000 K°. (Take constant value - 0.73 and e-2.718).arrow_forward
- The Hα spectral line has a rest wavelength of 6562.8 ˚A (remember: 1 ˚A = 10−10 m). In star A, the lineis seen at 6568.4 ˚A, in star B it’s seen at 6560.3 ˚A, and in star C it’s seen at 6562.8 ˚A. Which star ismoving the fastest (along the line of sight) and what is the radial velocity of each star?arrow_forwardHertzsprung-Russell Diagram Blue White Yellow Red-orange Red Beteigruse Aldebaran Glants White Dwarfs 50.000 20,000 10,000 5.000 3,000 Surface Temperature ('C) Which star listed below is the brightest? O Sun O Sirius B O Betelgeuse O Rigel e0. buseanuarrow_forwardIf you observe a star’s blackbody spectrum twice, once from Earth and once from a space shuttle above Earth’s atmosphere, what will you see? An absorption spectrum from Earth and a continuous spectrum from space An absorption spectrum from space and a continuous spectrum from Earth An absorption spectrum from space and an absorption spectrum with more absorption lines from Earth An absorption spectrum from Earth and an absorption spectrum with more absorption lines from spacearrow_forward
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