Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 14, Problem 8P
To determine
Doppler Shift for X-rays.
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The relationship between the average luminosity and pulsation period for Cepheid variable stars can be written L = L⊙P3.7, where the period P is measured in days. A cepheid variable is observed in a distant galaxy, and is determined to have a pulsation period of 50 days. The average flux received from this star is measured to be 2.14×10−16Wm−2. Determine the distance to the galaxy and express your answer in units of Mpc.
A cloud of mean number density n ~ 3000 cm-3 and radius 3 pc has an ionising
source with luminosity at 13.6 eV of L13.6eV = 2.18 x 109 erg s- at the centre.
(a) What is the size of the HII region in pe? [og = 2 x 10-13 cms-].
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(b) What assumptions are involved in part
a)
(c) Discuss why the HII region will drive a shock into the rest of the cloud, and
calculate the post-shock density.
(d) Show why this HII region will destroy the cloud.
A star has initially a radius of 660000000 m and a period of rotation about its axis of 34
days. Eventually it changes into a neutron star with a radius of only 35000 m and a period of
0.2 s. Assuming that the mass has not changed, find
Assume a star has the shape of a sphere.
(Suggestion: do it with formula first, then put the numbers in)
[Recommended time : 5-8 minutes]
(a) the ratio of initial to final angular momentum (Li/Lf)
Oa. 5.22E+15
Ob. 24.2
Oc. 0.0413
Od. 1.91E-16
(b) the ratio of initial to final kinetic energy
Oa. 1.3E-23
Activate V
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Ob. 607000
Oc. 1.65E-6
e here to search
Chapter 14 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 14 - Prob. 1QFRCh. 14 - Prob. 2QFRCh. 14 - Prob. 3QFRCh. 14 - Prob. 4QFRCh. 14 - Prob. 5QFRCh. 14 - Prob. 6QFRCh. 14 - Prob. 7QFRCh. 14 - Prob. 8QFRCh. 14 - Prob. 9QFRCh. 14 - Prob. 10QFR
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