Download Astronomy Chapter 13 Name

Astronomy
Chapter 13
Name: ________________________________
Worksheet 1
Block: ________________________________
Match the definitions to the correct word or term
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1. Magnitude
A. A relation between the mass and luminosity of stars
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2. White dwarfs
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3. Radial velocity
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4. Binary stars
B. A binary star pair in which one star periodically passes in
front of the other
C. The shift in an object’s position caused by the observer’s
motion
D. A type of binary star in which the spectrum lines exhibit a
changing Doppler shift as a result of the orbital motion of
one star around the other
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5. Method of standard candles
E. The amount of energy radiated per second by a body
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6. Eclipsing binary
F. A method for measuring distances
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7. Giant
G. The time required for a repetitive process to repeat
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8. Variable star
H. A small, dim star
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9. H-R diagram
I.
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10. Parsec
J.
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11. Red giants
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12. Parallax
13. Triangulation
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14. Inverse-square law
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15. Visual binary
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16. Spectroscopic binary
K. The law stating that the apparent brightness of a body
decreases inversely as the square of its distance
L. A star whose luminosity changes in time
M. The region in the H-R diagram in which most stars are
located
N. A dense star whose radius is approximately equal to
Earth’s but whose mass is comparable to the Sun’s
O. Two stars in orbit around each other, held together by their
mutual gravity
P. A pair of stars held together by their mutual gravity and in
orbit about each other, and which can be seen with a
telescope as separate objects
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17. Period
18. Main sequence
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19. Spectral class
Q. A unit for measuring stellar brightness
R. A cool, luminous star whose radius is much larger than the
Sun’s
S. A unit of distance equal to about 3.26 light-years
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20. Luminosity
21. Mass-luminosity relation
T. A star of large radius and large luminosity
U. The velocity of a body along the line of sight
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22. Dwarf
V. A graph in which stars are located according to their
temperature and luminosity
An indicator of a star’s temperature, based on the
appearance of its spectrum lines
A type of star in which the luminosity has a known value,
allowing its distance to be determined by measuring its
apparent brightness and applying the inverse-square law
Answer the following questions
23. How is the parsec defined? How big is a parsec compared with a light-year?
24. What is luminosity? What two characteristics of a star determine its luminosity?
25. Why do stars have dark lines in their spectra?
26. What is a binary star?
27. How do we know that giant stars are big and dwarfs small?
28. What is meant by the period of a variable star?