Exam 10: The Deaths of Stars

A gas in which the pressure no longer depends on the temperature of the gas is said to be ____________________.

If the Sun and stars are supported by gas pressure, what supports a white dwarf

As material leaves an expanding star and begins to fall into a white dwarf close companion

When an aging massive star generates an iron core, the iron cannot fuse and thus the star cannot support its weight outside the core. The star is no longer in hydrostatic equilibrium and collapses, forming a supernova.

The age of a star cluster can be determined from the ____________________ of the cluster.

Which nuclear fusion processes occur in Sun-like stars

Hydrogen fusion does not occur in stars in the giant region of the H-R diagram.

What do astronomers think is the eventual fate of a white dwarf

Synchrotron radiation occurs when high-speed electrons move through a magnetic field.

Which of the following nuclear fuels does a twenty-solar-mass star NOT fuse over the course of its entire evolution

The _________ stars are giant stars fusing helium in their cores and then in their shells.

Once a star ejects a planetary nebula, it becomes a white dwarf.

The electron spirals around a magnetic field line and emits photons in a process called _________________.

As a white dwarf cools its radius will not change because

A(n) ____________________ is the sudden expulsion of the outer layers of a moderate mass star that has a dormant carbon core.

The central star in a planetary nebula

A(n) ____________________ is the expulsion of the outer layers of a moderate-mass star that has a degenerate carbon and oxygen core.

-The nebula shown above is an example of a _____________ nebula.

-The HST visual wavelength image shown above is an example of a __________, where gaseous material is blown off the surface of a white dwarf.

The lowest-mass stars cannot become giants because