Question 1

Which are the most common stars,massive stars or low-mass stars (relative to the Sun)? High luminosity or low luminosity (relative to the Sun)?

Accepted Answer

The answer of Which are the most common stars,massive stars...

Question 2

How can we find the distance to a star that is too distant to have a measurable parallax?

Accepted Answer

The answer of How can we find the distance to...

Question 3

An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 : 1,and that the total mass of the two stars is 26 solar masses.What are the masses of star A and star B?

Accepted Answer

A) Star A has a mass of 1 solar mass and star B has a mass of 6 solar masses. 
B) Star A has a mass of 20 solar masses and star B has a mass of 6 solar masses. 
C) Star A has a mass of 22.3 solar masses and star B has a mass of 3.7 solar masses. 
D) Star A has a mass of 31.2 solar masses and star B has a mass of 5.2 solar masses. 
A) Star A has a mass of 1 solar mass and star B has a mass of 6 solar masses. 
B) Star A has a mass of 20 solar masses and star B has a mass of 6 solar masses. 
C) Star A has a mass of 22.3 solar masses and star B has a mass of 3.7 solar masses. 
D) Star A has a mass of 31.2 solar masses and star B has a mass of 5.2 solar masses.

Question 4

Supergiants are about as common as the Sun.

Accepted Answer

A) True 
 B)False

Question 5

Why would parallaxes be easier to observe if the Earth were farther from the Sun?

Accepted Answer

Parallax is the apparent shift in positi

Question 6

White dwarfs have such low luminosity that even the nearest white dwarfs are not visible to the naked eye.

Accepted Answer

A) True 
 B)False

Question 7

A star with a parallax of 0.01 seconds of arc is at a distance of 1000 parsecs.

Accepted Answer

A) True 
 B)False

Question 8

How do humans use their eyes to measure relative distance by parallax?

Accepted Answer

A) By continuously focusing our eyes on distant objects, we can determine distance. 
B) Since our eyes are separated, the brain interprets the relative look angles of the two eyes in terms of distance to the object viewed. 
C) Our eyes can measure the time it takes light to travel from an object, and from this we get distance. 
D) As we move our heads from side to side, our brain compares look angles from each of these positions to work out the distance to the object viewed. 
A) By continuously focusing our eyes on distant objects, we can determine distance. 
B) Since our eyes are separated, the brain interprets the relative look angles of the two eyes in terms of distance to the object viewed. 
C) Our eyes can measure the time it takes light to travel from an object, and from this we get distance. 
D) As we move our heads from side to side, our brain compares look angles from each of these positions to work out the distance to the object viewed.

Question 9

What would make parallax easier to measure?

Accepted Answer

A) the Earth's orbit being larger 
B) the stars being farther away 
C) the Earth moving faster along its orbit 
D) stars moving faster in their orbits 
A) the Earth's orbit being larger 
B) the stars being farther away 
C) the Earth moving faster along its orbit 
D) stars moving faster in their orbits

Question 10

Define the range of a property as the maximum value divided by the minimum value.Which property of stars has the greatest range?

Accepted Answer

A) mass 
B) radius 
C) luminosity 
D) temperature 
A) mass 
B) radius 
C) luminosity 
D) temperature

Question 11

How does luminosity depend on temperature for stars of the same size?

Accepted Answer

The luminosity of a star, which is the t

Question 12

The most common kinds of stars are low luminosity stars.

Accepted Answer

A) True 
 B)False

Question 13

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

Accepted Answer

A) True 
 B)False

Question 14

What information about orbital inclination can we get from visual binaries,from spectroscopic binaries,and from eclipsing binaries?

Accepted Answer

Orbital inclination is the angle between

Question 15

If the orbital velocity of an eclipsing binary is 97 km/sec and the smaller star is completely eclipsed in 2 hours,what is the diameter of the smaller star?

Accepted Answer

A) 194 km 
B) 4656 km 
C) 350,000 km 
D) 700,000 km 
A) 194 km 
B) 4656 km 
C) 350,000 km 
D) 700,000 km

Question 16

Consider two binary star systems,A and B,in which the distance between the stars is the same.If the total mass of the stars in system A is greater than the total mass of the stars in system B,which of following can you conclude?

Accepted Answer

A) The primary in A is closer to the centre of mass than the primary in B. 
B) The primary in A is farther from the centre of mass than the primary in B. 
C) The orbital period of the stars in A is shorter than the orbital period of the stars in B. 
D) The orbital period of the stars in A is longer than the orbital period of the stars in B. 
A) The primary in A is closer to the centre of mass than the primary in B. 
B) The primary in A is farther from the centre of mass than the primary in B. 
C) The orbital period of the stars in A is shorter than the orbital period of the stars in B. 
D) The orbital period of the stars in A is longer than the orbital period of the stars in B.

Question 17

We can find the masses and diameters of stars that are in eclipsing binary systems.

Accepted Answer

A) True 
 B)False

Question 18

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?

Accepted Answer

The answer of How does an H-R diagram make it...

Question 19

The parsec is defined so that a star at a distance of 1 parsec has a parallax of one arcsecond.If a star has a parallax of 0.02 seconds of arc,what is its distance?

Accepted Answer

A) 2 parsecs 
B) 5 parsecs 
C) 20 parsecs 
D) 50 parsecs 
A) 2 parsecs 
B) 5 parsecs 
C) 20 parsecs 
D) 50 parsecs

Question 20

The densest stars in the H-R diagram are the white dwarfs.

Accepted Answer

A) True 
 B)False

Which are the most common stars,massive stars or low-mass stars (relative to the Sun)? High luminosity or low luminosity (relative to the Sun)?

How can we find the distance to a star that is too distant to have a measurable parallax?

An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 : 1,and that the total mass of the two stars is 26 solar masses.What are the masses of star A and star B?

Supergiants are about as common as the Sun.

Why would parallaxes be easier to observe if the Earth were farther from the Sun?

White dwarfs have such low luminosity that even the nearest white dwarfs are not visible to the naked eye.

A star with a parallax of 0.01 seconds of arc is at a distance of 1000 parsecs.

How do humans use their eyes to measure relative distance by parallax?

What would make parallax easier to measure?

Define the range of a property as the maximum value divided by the minimum value.Which property of stars has the greatest range?

How does luminosity depend on temperature for stars of the same size?

The most common kinds of stars are low luminosity stars.

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

What information about orbital inclination can we get from visual binaries,from spectroscopic binaries,and from eclipsing binaries?

If the orbital velocity of an eclipsing binary is 97 km/sec and the smaller star is completely eclipsed in 2 hours,what is the diameter of the smaller star?

Consider two binary star systems,A and B,in which the distance between the stars is the same.If the total mass of the stars in system A is greater than the total mass of the stars in system B,which of following can you conclude?

We can find the masses and diameters of stars that are in eclipsing binary systems.

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?

The parsec is defined so that a star at a distance of 1 parsec has a parallax of one arcsecond.If a star has a parallax of 0.02 seconds of arc,what is its distance?

The densest stars in the H-R diagram are the white dwarfs.

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

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Exam 6: The Family of Stars

Which are the most common stars,massive stars or low-mass stars (relative to the Sun)? High luminosity or low luminosity (relative to the Sun)?

How can we find the distance to a star that is too distant to have a measurable parallax?

An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 : 1,and that the total mass of the two stars is 26 solar masses.What are the masses of star A and star B?

Supergiants are about as common as the Sun.

Why would parallaxes be easier to observe if the Earth were farther from the Sun?

White dwarfs have such low luminosity that even the nearest white dwarfs are not visible to the naked eye.

A star with a parallax of 0.01 seconds of arc is at a distance of 1000 parsecs.

How do humans use their eyes to measure relative distance by parallax?

What would make parallax easier to measure?

Define the range of a property as the maximum value divided by the minimum value.Which property of stars has the greatest range?

How does luminosity depend on temperature for stars of the same size?

The most common kinds of stars are low luminosity stars.

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

What information about orbital inclination can we get from visual binaries,from spectroscopic binaries,and from eclipsing binaries?

If the orbital velocity of an eclipsing binary is 97 km/sec and the smaller star is completely eclipsed in 2 hours,what is the diameter of the smaller star?

Consider two binary star systems,A and B,in which the distance between the stars is the same.If the total mass of the stars in system A is greater than the total mass of the stars in system B,which of following can you conclude?

We can find the masses and diameters of stars that are in eclipsing binary systems.

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?

The parsec is defined so that a star at a distance of 1 parsec has a parallax of one arcsecond.If a star has a parallax of 0.02 seconds of arc,what is its distance?

The densest stars in the H-R diagram are the white dwarfs.

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters