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Astronomy > Starz > Flashcards

Starz Flashcards

0
Q

On the x-axis of the HR diagram, the temperature increases _____

A

From right to left

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1
Q

The relative brightness of the stars as we see them in our sky is represented by their _____

A

Apparent Magnitude

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2
Q

The HR diagram is a diagram plotting the stars according to their ____ and _____

A

Temperature & luminosity

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3
Q

Binary star systems are very important because they allow _____ of star masses

A

Measurement

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4
Q

The parallax of a star is an _____ usually measured in _____

A

Angle/distance arcsins/degrees

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5
Q

A nearby star is likely to have _____ parallax compared to a star further away

A

More

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6
Q

The amount of energy emitted by a star each second is its ______ and is measured in _____

A

Luminosity Watts

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7
Q

Analysis of stellar spectra shows that most stars consist of 71% _____ 27% _____ and a 2% mix of the other elements

A

Hydrogen Helium

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8
Q

Star A and Star B have same temp, but Star A is more luminous than Star B. based on this information, which of the following can be interpreted

A

Star A is larger than Star B

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9
Q

Luminosity (absolute brightness) of a star depends on its _____ and ______

A

Temperature and Radius

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10
Q

Triangulation

A

Method for measuring distance to nearby stars

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11
Q

The Method of Standard Candles can be used to determine _____

A

Distance

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12
Q

Parallax measurements of the distances to the nearest stars use ______ as a baseline

A

Earths orbit

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13
Q

What is the difference between spectroscopic (1) and visual binaries (2)

A

(1) blurry stars

(2) two distinct stars

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14
Q

Wien’s law can only tell us about the ______ ______ of a star, not the temp of the invisible interior of a star

A

Surface Interior

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15
Q

One parsec is equal to _____ light years

A

3.26

16
Q

The sun is a _____ type star

A

G2V

17
Q

The color of a star indicates its relative _______

A

Temperature

18
Q

Red stars are _____ than blue stars

A

Cooler

19
Q

The amount of energy a star emits each second is its _______

A

Luminosity

20
Q

Parallax is best used to determine the distances of stars _____ than 250 parsecs away

A

Less

21
Q

Derived by Hipparchus, magnitude 1 stars are _______ than magnitude 6 stars

A

Brighter

22
Q

The letters O,B,A,F,G,K, and M are classes of stars based on ______

A

Temperature

23
Q

When a star is moving towards the observer, it’s wavelength of light emission becomes ______

A

Shorter (blue)

24
Q

Spectral line scan be used to determine a star’s _______

A

Composition

25
Q

_____ % of stars are considered main sequence stars

A

90

26
Q

The three stellar types are:

A

Main sequence
Red giants
White dwarfs

27
Q

The distance of a star from Earth determines its luminosity

A

False

28
Q

A stars spectrum typically depicts the energy it emits at each wavelengths

A

True

Astronomy (2 decks)

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