Chapter 10

Question 1

What part of a star’s velocity is measured by the Doppler Effect?

Answer 1

Line-of-Sight

Question 2

What important property of a star do we learn from its spectral class?

Answer 2

Temperature

Question 3

How do we typically determine the radius of a star?

Answer 3

Calculation of radius after determining temperature and luminosity

Question 4

What is NOT useful in constructing a Hertzsprung-Russell (H-R) diagram?

Answer 4

Measuring the Star’s size

Question 5

Why are the most common stars among the most difficult to observe?

Answer 5

They have low luminosities

Question 6

Why does the spectroscopic parallax method only work for main sequence stars?

Answer 6

Only main sequence stars have a well-defined relationship between spectral type and luminosity.

Question 7

What is the full spectral classification of the sun?

Answer 7

G2V

Question 8

What property of stars can be measured only by using the binary-star systems?

Answer 8

Mass

Question 9

From a distance of 1 parsec, the angular size of Earth’s orbit would be

Answer 9

2 arc seconds

Question 10

Compared with a star of absolute magnitude -2 at a distance of 100 pc, a star of absolute magnitude 5 at a distance of 10 pic will appear

Answer 10

Fainter

Question 11

Cool stars can be very luminous if they are very

Answer 11

Large

Question 12

The well known star Barnard’s star must be

Answer 12

Larger

Question 13

The mass of a star may be determined

Answer 13

By studying its orbit around a binary composition

Question 14

A star has a parallax of .05”. It’s distance is

Answer 14

20 parsecs

Question 15

How much brighter will a 4th magnitude star appear than a 6th magnitude star

Answer 15

6.25 times

Question 16

Which of these stars would be the hottest

Answer 16

B0

Question 17

The stars with masses comparable to our sun’s, but sizes like the Earth are

Answer 17

White dwarfs

Question 18

If we know the average separation period of revolution for a binary system, we can then measure

Answer 18

The total mass of the system

Question 19

According to the stellar spectra classification, Type A stars would have _____ hydrogen features than/as Type B stars.

Answer 19

More

Question 20

What is the order of the Stella spectra classification today

Answer 20

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

Question 21

The order of the Stella spectra classification used today is based on the stars

Answer 21

Surface temperature

Question 22

In order to determine a stars luminosity using its apparent magnitude, one must also determine its

Answer 22

Distance

Question 23

Most stars in our galaxy are

Answer 23

White dwarfs

Question 24

What is the major factor in determining how a star forms, it’s age, how it will die, and its position on the main sequence?

Answer 24

Mass

Question 25

On the H-R diagram the white draw region is

Answer 25

Bottom left corner

Question 26

On the H-R diagram the main sequence is

Answer 26

On the line, in center

Question 27

On the H-R diagram the red dwarf region

Answer 27

At the bottom right corner on main sequence line

Question 28

On the H-R diagram the Red giant region is

Answer 28

Above the main sequence in center

Question 29

The majority of bright naked eye stars are blue or white in color. On the H-R diagram, they would lie

Answer 29

In the high luminosity and High temperature region

Question 30

On the H-R diagram, the main sequence runs from

Answer 30

High luminosity, high temperature region to low luminosity, low temperature

Question 31

Which of the following is Not an intrinsic property of a star?

Answer 31

Luminosity DISTANCE Temperature Mass