21ST CENTURY ASTR.:SOLAR..(LL)-PACKAGE
21ST CENTURY ASTR.:SOLAR..(LL)-PACKAGE
6th Edition
ISBN: 9780393448498
Author: Kay
Publisher: NORTON
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Chapter 13, Problem 18QP

(a)

To determine

The comparison between the relative temperature of the two stars.

(b)

To determine

The comparison between the sizes of the stars.

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The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is greater 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.
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.
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