21ST CENT.AST.W/WKBK+SMARTWORK >BI<
6th Edition
ISBN: 9780393415216
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 12QP
To determine
The comparison of luminosities of stars A and B.
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Barnard’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.
The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is less than its laboratory value of 656.3 nm, one can conclude that...
A.
The separation between Earth and the star is decreasing.
B.
The separation between Earth and the star is increasing.
C.
The separation between Earth and the star is unchanging
D.
No conclusion is possible.
Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?
a.
There is no hydrogen in stars this cool.
b.
The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy.
c.
These stars are so cool that nearly all of the hydrogen atoms are in the ground state.
d.
Stars of this temperature are too cool to produce an absorption spectrum.
e.
Stars of this temperature are too hot to produce an absorption spectrum.
Chapter 5 Solutions
21ST CENT.AST.W/WKBK+SMARTWORK >BI<
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's spectrum peaks at 500 nm. What is the surface temperature of the star? O a. 5000 K b.2000 K C.5.8 x 106 K d.5800 Karrow_forwardA star that is moving toward Earth will a. have its spectral lines shifted to the red. b. have its spectral lines shifted to the blue. c. appear hotter than it actually is. d. appear cooler than it actually is. e. appear dimmer than it actually is.arrow_forwardA group of four stars, all the same size, have the four different surface temperatures given below. Which of these stars emits the most red light?A. 3000 K B. 4000 K C. 5000 K D. 6000 Karrow_forward
- A bright red star is moving towards Earth. Which of the choices best completes the following statement describing the spectrum of this star? A(n) ___________ spectrum that is _______ relative to an unmoving star. A. continuous; blueshifted B. continuous; redshifted C. emission; redshifted D. absorption; blueshifted E. absorption; redshiftedarrow_forwardB2. A spherical star is detected by an astronaut in a spacecraft at a distance z of 1.5×10¹2 kilometers. The star can be regarded as a blackbody with a temperature of 11,300 K. The radius r of the star is 3.5×106 kilometers. (a) Calculate the radiant exitance and the radiant intensity of the star. (b) Calculate the irradiance that can be detected by the astronaut. (c) The photodetector used by the astronaut in the spacecraft has a responsivity of 120 kV/W and an photosensitive area of 0.5 mm². Calculate the output voltage of the detector in the detection of the star. CAMINS +II+ Figure B2arrow_forwardPolaris is an F7 star. Which of the following spectral types is slightly cooler than Polaris? A. G5 B. M4 C. B6 D. A6 E. K9arrow_forward
- 3. Consider two stars. Star A has a surface temperature of 12000 K. Star B has a surface temperature of 6000 K. The diameter of star A is twice of the diameter of star B. The two stars have the same apparent magnitude. Answer the following questions about star A and star B. There is no need to explain (a) Which star is more luminous (i.e. emitting more radiation power)? (b) Which star is brighter in the sky? (c) Which star is at a larger distance (measuring from Earth)?arrow_forwardProblem 1. The Sun as seen from Earth has an apparent magnitude of -26 in the B-band. 1. What is the Sun's absolute magnitude (in the B-band)? 2. What would its apparent magnitude be as seen from Jupiter? (Jupiter is approximately 5.2 AU from the Sun.) 3. At a certain distance d from a Star A, its apparent brightness is f. If we were to travel at a relativistic velocity to a point in space which is 5 times further away, how much fainter would the star appear to us? (i.e. what fraction of its original apparent brightness would it now appear to us?)arrow_forwardA 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_forward
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