Chapter 13 Terms Flashcards Preview

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Flashcards in Chapter 13 Terms Deck (20):
1

Binary Star

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

2

Dwarf

is a small dim star

3

Eclipsing Binary

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

4

Giant

is a star of large radius and large luminosity

5

H-R Diagram

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

6

Luminosity

is the amount of energy radiated per second of a body

7

Magnitude

is a unit for measuring stellar brightness

8

Main Sequence

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

9

Mass-Luminosity Relation

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

10

Parallax

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

11

Parsec

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

12

Radial Velocity

is the velocity of a body along the line of sight

13

Red Giant

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

14

Spectral Type

is an indicator of a star’s temperature

15

Spectroscopic Binary

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

16

Standard Candle

is a type of star or other astronomical body

17

Triangulation

is a method for measuring distances

18

Visual Binary

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

19

White Dwarf

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

20

Wien’s Law

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