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Astronomy > Chapter 13 Terms > Flashcards

Chapter 13 Terms Flashcards

1
Q

Binary Star

A

is two or more stars in orbit around each other, held together by their mutual gravity

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2
Q

Dwarf

A

is a small dim star

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3
Q

Eclipsing Binary

A

is a binary star pair in which one star periodically passes in front of the other

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4
Q

Giant

A

is a star of large radius and large luminosity

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5
Q

H-R Diagram

A

is a graph on which stars are located according to their temperature and luminosity

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6
Q

Luminosity

A

is the amount of energy radiated per second of a body

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7
Q

Magnitude

A

is a unit for measuring stellar brightness

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8
Q

Main Sequence

A

is the region in the H-R diagram in which most stars, including the Sun, are located

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9
Q

Mass-Luminosity Relation

A

is a relationship between the mass and luminosity of main-sequence stars

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10
Q

Parallax

A

is the shift in an object’s position caused by the observer’s motion

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11
Q

Parsec

A

is a unit of distance equal to about 3.26 light-years

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12
Q

Radial Velocity

A

is the velocity of a body along the line of sight

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13
Q

Red Giant

A

a cool luminous star whose radius is much larger than the Sun’s

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14
Q

Spectral Type

A

is an indicator of a star’s temperature

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15
Q

Spectroscopic Binary

A

is a type of binary star for which the spectrum lines exhibit a changing Doppler shift because of the orbital motion of one star around the other

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16
Q

Standard Candle

A

is a type of star or other astronomical body

17
Q

Triangulation

A

is a method for measuring distances

18
Q

Visual Binary

A

a pair of stars held together by their mutual gravity and in orbit about each other

19
Q

White Dwarf

A

is a dense star whose radius is approximately the same as Earth’s but whose mass is comparable with the Sun’s

20
Q

Wien’s Law

A

is the relation between a body’s temperature and wavelength at which it emits radiation most intensely

Astronomy (13 decks)

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