UNIVERSE (LOOSELEAF):STARS+GALAXIES
6th Edition
ISBN: 9781319115043
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 19, Problem 42Q
To determine
(a)
The average distance between the two stars of W UrsaeMajoris.
To determine
(b)
Whether or not, the statement that this system is an overcontact binary is consistent with the radii of the two stars and their average separation.
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An O8 V star has an apparent visual magnitude of +5. Use the method of spectroscopic parallax to estimate the distance to the star (in pc). (Hints: Refer to one of the H–R diagrams in the chapter, and use the magnitude–distance formula,
d = 10(mV − MV + 5)/5
where d is the distance in parsecs, mV and MV are the apparent and absolute visual magnitude respectively.)
velocity curve for a double line
spectroscopic binary is shown in the sketch.
The system is viewed edge-on, i.e., with an
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system are observed.
400
300
So = U, Ani
200
t0 = v Ain i
100
-100
-200
-300
400
O 1 2 3 1 s 1 8: 10
Time (days)
Find the orbital period of this binary in days.
Doppler Velocity (krn/sec)
The star Rigel has a radial velocity r = 20.7km s-1, parallax 700 =
4.22mas, and proper motion components la= 1.67mas yr'in right ascension
and us = 0.56mas yr1 in declination. What are its total proper motion,
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Chapter 19 Solutions
UNIVERSE (LOOSELEAF):STARS+GALAXIES
Ch. 19 - Prob. 1QCh. 19 - Prob. 2QCh. 19 - Prob. 3QCh. 19 - Prob. 4QCh. 19 - Prob. 5QCh. 19 - Prob. 6QCh. 19 - Prob. 7QCh. 19 - Prob. 8QCh. 19 - Prob. 9QCh. 19 - Prob. 10Q
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