FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 13: Taking the Measure of Stars

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 1

Multiple Choice

Review LaterAdd Note

Review Later

In a binary star system that contains stars with and ,the velocity of the star will be __________ times the velocity of the star.

A) 0.2
B) 0.5
C) 1
D) 2

Correct Answer

verified

Show Answer

Question 2

Essay

Review LaterAdd Note

Review Later

Star A is exactly the same color as star B and appears equally bright.Through stellar parallax we find that star B is twice as far away from us as star A.Determine which star has the largest radii and how much larger it is.

Correct Answer

verified

First,for stars of equal brightness,lumi...

View Answer

Show Answer

Question 3

Essay

Review LaterAdd Note

You observe a binary star system and find that star 1 has a velocity of 20 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars ? If you find that the separation of the two stars is 0.5 AU and the orbital period is 70 days,then what are the individual masses of the two stars?

If a star's distance is 10 pc,what is its parallax?

The spectral class of a star is related to its

If we measure a star's luminosity and temperature,what other property of the star can we calculate? Explain how.

When looking at a standard H-R diagram,the hottest stars are on the left-hand side of the diagram.

If a star's measured parallax is 0.2 arcsec,what is its distance?

Stars X and Y are 5 AU apart from each other.Star X is 4 times as massive as star Y.The center of mass of this system is __________ AU away from star X and __________ AU away from star Y.

Explain how we can use spectroscopic parallax to determine the distance to a star farther away than a few hundred light-years.

The faster-moving star in a binary is

B stars are cooler than M stars.

Rigel is a star with an apparent magnitude of +0.1,and Betelgeuse is a star with an apparent magnitude of +0.4.Which star appears brighter,and what is the ratio of their brightnesses?

Mass determines the position of a star on the main sequence.

Parallax is used to measure

Eclipsing binary systems

How is the unit of length known as a parsec defined?

A star with the same luminosity as the Sun,but which is twice as hot,must be four times as big.

It is not possible to detect a measurable parallax for even the closest stars without the use of a telescope.

You discover a binary star system in which star A has a velocity of 10 km/s and star B has a velocity of 30 km/s.If you study the system further and find out that the orbital period is 30 days and the orbital separation is 0.3 AU then what are the masses of stars A and B?