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Astromy 104 > Exam > Flashcards

Exam Flashcards

1
Q

What is stage 13 of stellar evolution?

A

White dwarf

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2
Q

What is stage 4 of stellar evolution?

A

Protostars

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3
Q

What happens after a type one supernova?

A

Nothing or very little of a star remains

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4
Q

What can happen after a type 2 supernova?

A

A neutron star can develope

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5
Q

Nebula have what effect on light?

A

Nebula are made of dust incoming light is reddened

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6
Q

What determines where a star will land on the main sequence?

A

Mass determines where it lands

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7
Q

What are the 3 main parts of a galaxy?

A

The disk, galactic halo and galactic bulge

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8
Q

What is the mass required for a star to turn into a blackhole?

A

Anything exceeding 25 solar masses

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9
Q

What are the 4 main parts 0f a spiral galaxy?

A

Spiral arms, galactic budge, galactic halo, and the disk

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10
Q

What does the helium flash convert helium nuclei into?

A

Carbon

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11
Q

Where are complex molecules in the interstellar medium found?

A

Primarily in dense dust clouds.

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12
Q

When do high mass stars die?

A

When they burn through their resources and the core turns to iron

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13
Q

A neutrons core consist of what?

A

Compressed neurons in contact with each other

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14
Q

The speed of light is what?

A

The same always regardless of the observers position

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15
Q

In the lighthouse model what happens?

A

If the beam sweeps across us we will detect a pulse of radiation

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16
Q

What stages of stellar evolution are red giants found in?

A

Stages 9 And 11

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17
Q

What temps true is an O type star?

A

30000 kelvin

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18
Q

A star will spend most of its life on what?

A

The main sequence

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19
Q

When do high mass starts leave the Main sequence ?

A

High mass stars leave the main sequence when there is no more hydrogen in the core

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20
Q

What are the two types of super nova?

A

Type 1 Carbon detonation

Type 2 death of a high mass star

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21
Q

How does a type 1 super Nova occur?

A

When a white dwarf has accumulated too much mass from a sibling star

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22
Q

General relativity deals with what?

A

Gravity and space time

23
Q

Special relativity deals with what?

A

Deals with light and motion

24
Q

What does the galactic Halo contain?

A

Old stars
No gas or dust
No new star formations.
Red in color

25
Q

What are the 4 characteristics of the galatic bulge?

A

Old and new stars older stars being further from the center
Gas and dust towards the inner regions
Star formations in the inner region
Yellowish white in appearance

26
Q

What are the 4 characteristics of the galatic disk?

A

A flat appearance
Old And young stars
Gas and dust
A state of ongoing star formation

27
Q

What galaxy types are active?

A

Radio
Seyfert highly luminous
Quasar quasi stellar

28
Q

How does the Tully fisher relation work?

A

Correlates the galaxy’s rotation speed with the Doppler affect to it’s luminosity

29
Q

What are the characteristics of an elliptical Galaxy?

A

No disk
Old stars
Little or no cool gas and dust

30
Q

What are the 4 characteristics of Irregular galaxies?

A

No structure
Old and new stars
Rich in gas and dust
Ongoing star formations

31
Q

What’s the difference between and active and normal Galaxy?

A

Active galaxies are visible in all ranges of the electro magnetic spectrum normal Galaxies drop at the visible light spectrum

32
Q

What distance our cepheid variables good at?

A

25 mpc they use the period And the luminosity to calculate distance

33
Q

What’s the 2 characteristics of a globular cluster?

A

They consist of mostly old stars red Giants

Globular clusters reside outside of the galactic plain

34
Q

What are the 3 characteristics of an open cluster?

A

They reside inside the galactic plain
They have low numbers of stars
Mostly young stars

35
Q

What happens as a star evolves?

A

Density goes up and diameter goes down

36
Q

What stage of stellar evolution does a star make it onto the HR diagram?

A

Stage four the protostar

37
Q

REDSHIFT means what?

A

Away

38
Q

Blueshift means what?

A

Towards

39
Q

Sa stands for what?

A

Spiral armed with the biggest central budge

40
Q

Sb stands for what?

A

Spiral armed smaller central bulge

41
Q

Sc stands for what?

A

Spiral armed smallest central budge

42
Q

What does E0 stand for ?

A

Elliptical galaxy with almost perfect circular eccentricity

43
Q

What does the rotation of a galaxy result in?

A

Doppler broadening of its spectral lines

44
Q

If a stars initial solar mass is greater than 12, what will happen?

A

A supernova it’s gonna blow

45
Q

A star of more than 8 solar masses can do what?

A

Can fuse elements far beyond carbon

46
Q

What happens as stars evolve?

A

As density goes up diameter goes down

47
Q

When was the first pulsar detected?

A

1967 by Jocelyn bell

48
Q

What are the 3 characteristics of a irregular Galaxy?.

A

No structure
Contains Both old and new stars
Contains gas and dust

49
Q

What our two things that are true about elliptical galaxies?

A

They don’t have arms or a disk

50
Q

What is said to have at the center of a galaxy?

A

A blackhole

51
Q

How are seyfert galaxies different from normal galaxies?

A

Their cores are much more luminous

52
Q

What number of solar masses will it take for a neutron star to become a black hole

A

3 solar masses

53
Q

How many light years is a parsec?

A

3

Astromy 104 (2 decks)

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