Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Astronomy > Chapter 16 > Flashcards

Chapter 16 Flashcards

1
Q

How far is the sun from the milky ways center

A

2/3 from the center

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What type of galaxy is our galaxy

A

A spiral galaxy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are nova and supernova called

A

Cataclysmic variables

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are stars who’s luminosity varies in a regular way but more subtly

A

Intrinsic variables

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the two types of intrinsic variables

A

RR Lyrae stars and Cephids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the period of luminosity for lyrae stars

A

0.5 to 1 day

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the luminosity period for a cepheid

A

1 to 100 days

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do we measure the distance to RR lyrae stars

A

They all have about the same luminosity, so knowing their apparent magnitude lets us calculate the distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How do we measure the distance to Cepheids

A

They have a luminosity that is strongly correlated with the period of their oscillation, so once we know that period we can calculate the distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where are RR lyrae stars mainly found

A

In globular clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are star clusters

A

They are groups of stars bound by gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the two types of star clusters

A

Open clusters and global clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Do stars near the center or the edge of the galaxy move faster

A

Near the center.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How fast does the sun and its neighbors move around the center of the galaxy

A

At 220 km/s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the galactic halo

A

It is essentially spherical, the stars in it are very old and it has no gas or dust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the galactic disc

A

It is where the youngest stars are, as well as star formation regions, large clouds of gas and dust

17
Q

What is the galactic bulge

A

It surrounds the galactic center and has a mix of older and younger stars

18
Q

How are orbits in the disk

A

They are in the same plane and in the same direction

19
Q

How are orbits in the halo and Bulge

A

Much more random

20
Q

How do we determine the milky ways mass

A

Keplers third law, we use the suns distance to the center and its period of revolution. It is 10^11M

21
Q

What does the orbital speed of an object depend on

A

The mass between it and the galactic center

22
Q

What is dark matter

A

It is the material that is predicted to account for the discrepancy between keplers third law and the mass observed in the form of gas and dust

23
Q

How old are the galaxies most ancient stars

A

13 billion years old

24
Q

How large is the galactic centers black hole

A

3.7 million solar masses

Astronomy (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions