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night sky > test 2 > Flashcards

test 2 Flashcards

1
Q

Spectral type of α Andromedae

A

B8IV

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2
Q

Another name for α Andromedae

A

Alpheratz

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3
Q

Spectral type of β Andromedae

A

M0III

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4
Q

Another name for β Andromedae

A

Mirach

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5
Q

Spectral type for γ1 Andromedae

A

K3III

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6
Q

Another name for γ1 Andromedae

A

Almach

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7
Q

Spectral type for δ Andromedae

A

K3III

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8
Q

Spectral type for 51 Andromedae

A

K3III

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9
Q

Another name for 51 Andromedae

A

Nembus

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10
Q

Spectral type for ο Andromedae

A

B6III

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11
Q

Spectral type for λ Andromedae

A

G8III

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12
Q

Spectral type for μ Andromedae

A

A5V

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13
Q

Name bright star, spectral type, and constellation (1)

A

Altair, A7 IV/V, Aquila

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14
Q

Name bright star, spectral type, and constellation (2)

A

Polaris, F7 Ib, Ursa minor

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15
Q

Name bright star, spectral type, and constellation (3)

A

Enif, K2 Ib, Pegasus

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16
Q

Name bright star, spectral type, and constellation (4)

A

Vega, A0 V, Lyra

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17
Q

Name bright star, spectral type, and constellation (5)

A

Deneb, A2 Ia, Cygnus

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18
Q

Name deep sky object in Andromedae (1)

A

M31

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19
Q

Name deep sky object in Andromedae (2)

A

NGC 752

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20
Q

Name deep sky object in Andromedae (3)

A

NGC 7662

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21
Q

Based on its main sequence turnoff point, the age of this cluster is:

A

About 10 billion years

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22
Q

Approximately how far is the Sun from the center of the galaxy?

A

28,000 light-years

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23
Q

Where does most star formation occur in the Milky Way today?

A

In the spiral arms

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24
Q

Why are telescopes sometimes called “time machines”?

A

Because observations of distant objects reveal them as they were in the past

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25
Q

After a supernova type II event, what is left behind?

A

Always a neutron star

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26
Q

Which of the following is the closest in size (r) to a white dwarf?

A

Earth

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27
Q

Which of the following is the closest in size (r) to a neutron star?

A

A city

28
Q

From the center outward, which of the following lists the “layers” of the sun in the correct order?

A

Core, Radiation Zone, Convection Zone, Photosphere, Chromosphere, Corona

29
Q

How does the Sun generate energy today?

A

Nuclear fusion

30
Q

A star’s luminosity is the…

A

Total amount of light that the star radiates each second

31
Q

The spectral sequence in order of decreasing temperature is:

A

O,B,A,F,G,K,M,

32
Q

Which group represents stars that are cool and dim?

A

d

33
Q

Which group represents stars that are hot but dim?

A

b

34
Q

Which group represents stars of the smallest radii?

A

b

35
Q

Which group represents stars of the largest radii?

A

e

36
Q

Which group represents stars that are hot and very bright?

A

c

37
Q

Which group represents hydrogen-burning stars with the shortest lifespan?

A

c

38
Q

Which group represents hydrogen-burning stars with the longest lifespan?

A

d

39
Q

Which group includes stars that are burning elements besides hydrogen in their cores?

A

a

40
Q

What do astronomers mean when they say that we are all “star stuff”?

A

That the carbon, oxygen, and many elements essential tot life were created by nucleosynthesis in stellar cores

41
Q

Your weird cousin… If he now wants to include tthe name of the galaxy’s spiral-structure features in which the Earth is located, how should the address end?

A

Orion spur

42
Q

A type of star cluster that contains mostly very old stars is…

A

A globular star cluster

43
Q

In a collapsing star of high mass, when protons and neutrons are squeezed together with enormous force, they turn into a neutron and a:

A

Neutrino

44
Q

A white dwarf, compared to a main sequence star with the same mass, would always be:

A

Smaller in diameter

45
Q

What happens as an electron falls from a higher level to a lower level in an atom?

A

A photon is given off

46
Q

As astronomers use the term- parallax of a star means:

A

One half the angle that a star shifts when seen from opposite sides of the Earth’s orbit

47
Q

The first astronomer who did photometry in a systematic way was:

A

Hipparctius

48
Q

What happens when an interstellar cloud fragment shrinks?

A

Density rises, temperature increases, and the mass remains the same

49
Q

What is the temperature rin the core of the Sun where hydrogen is fusing into helium?

A

10-15 million K

50
Q

What is the typical age for a globular cluster?

A

~12 billion years

51
Q

Which layer of the Sun do we normally see?

A

Photosphere

52
Q

Which of the following luminosity classes refers tot the main sequence stars?

A

V

53
Q

Which is true about globular clusters?

A

Most stars in the cluster are yellow or reddish in color

54
Q

You are out on the beach enjoying the sunshine. As you glance up at the sun, the part of the Sun you can directly see is its:

A

Photosphere

55
Q

The hottest zone in the Sun is the:

A

Core

56
Q

The granulation pattern that astronomers have observed on the surface of the sun tells us that:

A

Hot material must be rising from the Sun’s hotter interior

57
Q

Suppose you put two protons near each other. Because of the electromagnetic force, the two protons will ____ each other

A

Repel

58
Q

According to modern science, the sun is approximately _____ old

A

4.6 billion years

59
Q

Sirius A is a main sequence V star and its companion Sirius B is a white dwarf VIII (D) star. The evolutionary theory implies that Sirius A originally was the less _____ of the pair and therefore evolved more rapidly

A

Hot

60
Q

The central object of a planetary nebula is a _______.

A

Red giant

61
Q

The shortest-lived main sequence stars are those with the spectral type _____.

A

O

62
Q

The Sun will exhaust its nuclear fuel in about ______ years.

A

5 billion

63
Q

Red stars are spectral type _____ and have a surface temperature of approximately ______ K.

A

M, 3500

64
Q

The Sun’s surface has a temperature of about _____ K.

A

5800

65
Q

Betelgeuse is in the upper most right of the HR diagram, making it a _____.

A

M2-Iab

66
Q

The central object of the crab nebula is called ____

A

Crab pulsar

67
Q

Open clusters in the spiral arms contain _____ stars. In contrast, globular clusters of our Milky Way contain ______ stars.

A

younger, older

night sky (1 decks)

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