Question 411 pts Compared to the Sun, white dwarfs have higher _____ and lower _

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Question 411 pts

Compared to the Sun, white dwarfs have higher _____ and lower _____.

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Question 421 pts

What is the main way that Astronomers use variable or pulsating stars?  

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Question 431 pts

_____________ binary star systems are important because they allow astronomers to determine the mass and the _____________ of the stars in the system.

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Question 441 pts

Which of the following is an example of a Semi-Detached Binary?

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Question 451 pts

Which of the following is an example of a Starburst Galaxy?

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Question 461 pts

There is a close analogy between our solar system and the Milky Way. Which stars in the Milky Way make similar journeys around the galactic center as Comets make around the sun?  

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Question 471 pts

USE THE BRIGHTEST MEMBERS OF THE LOCAL GROUP HANDOUT FOR THE NEXT TWO QUESTIONS:  What is the farthest galaxy from us in the Local Group?

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Question 481 pts

What is the brightest looking galaxy in the Local Group?

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Question 491 pts

USE THE MESSIER CATALOG HANDOUT FOR THE NEXT TWO QUESTIONS:   Which of the following Messier Objects is visible to people on Earth viewing without a telescope?

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Question 501 pts

Which of the following Messier Objects is near the Zenith line for people living in LA?

Explanation / Answer

Answer 411 : Surface temperature ; Luminosity.

Explanation : Compared to the Sun, white dwarfs have higher surface temperatures and lower luminosity. The higher surface temperature is because of the heat left over from their formation and they have a lower luminosity because of its much smaller size.

Answer 421 : finding the brightness of stars

Explanation : Variable or pulsating stars expand and contract periodically resulting in changes in the brightness of these stars. Astronomers thus use these pulsating variable stars to find the brightness of stars

Answer 431 : Eclipsing, Temperature.

Explanation : Eclipsing binary stars are important because they allow astronomers to determine the mass and the temperature of the stars in the system. These in turn help them to determine the luminosity of the stars which is plotted against time.

Answer 441 : Algol

Explanation : Semi detached binary stars is a pair of stars that are so close together that one of the two stars expand beyond its Roche lobe and transfer of mass from one star to other takes place. Example - Algol.

Answer 451 : the Antennae.

Explanation : The Antennae galaxy is an example of a Starburst galaxy resulting from the collision of NGC 4038 and NGC 4039. They form stars at an unusually fast rate.

Answer 461 : The stars inside the nuclear bulge.

Explanation : The stars inside the nuclear bulge or near the center of Milky way orbit the center at extremely high speeds and have similar journey like Comets.

Answer 471 : Sagittarius.

Explanation : Sagittarius dwarf Irregular galaxy ( SagDIG) is the farthest galaxy from us in the local group at a distance of 3.39 light years from Earth.

Answer 481 : Andromeda (M31)

Explanation : The brighter an object is, the lower is its value of magnitude with the brightest objects reaching negative values. Andromeda (M31) has a magnitude of -21.58, making it the most brightest looking galaxy in the Local Group.

Please provide the Messier Catalog Handout required for answering 491 and 501.

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