Exam 20: Stellar Evolution: The Life and Death of a Star

How has the chemical composition of the core of the Sun changed in the past 4.5 billion years? Are earthlings (if any)likely to freeze in another 4-5 billion years? Explain.

Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

A high-mass star dies more violently than a low-mass star because:

The longest stage in the life cycle of a star is as a(n)________ star.

Eventually,all low mass stars will become white,then black,dwarfs.

Low mass stars should produce white dwarfs,while high mass stars will produce more compact end products.

How is the age of a star cluster determined?

Isolated main-sequence stars as massive as 10 to 12 times the mass of the Sun may still manage to avoid going supernova.Why?

A star is on the horizontal branch of the H-R diagram.Which statement is true?

As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant,its luminosity:

What is the significance of 8 solar masses in stellar evolution?

Modern astronomers have observed the complete life cycle for many stars,making stellar evolution one of the best-tested astronomical theories.

For our Sun,the production of carbon will be the end of its nucleosynthesis.

A star (no matter what its mass)spends most of its life:

A solar mass star will evolve off the main sequence when:

What is peculiar about Sirius based on historical records?

Noting the turnoff mass in a star cluster allows you to determine its:

What is the typical age for a globular cluster associated with our Milky Way?

The order of evolutionary stages of a star like the Sun would be Main Sequence,giant,planetary nebula,and finally:

The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars.