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Astronomy
White dwarves, and neutron stars
| Question | Answer |
|---|---|
| What is a white dwarf? | A dead corpse of a low-mass star |
| The most massive white dwarf is the __________. | Smallest |
| What kind of pressure keeps a white dwarf from contraction by gravity? | Electron degeneracy pressure |
| If a white dwarf is in a close binary, what happen? | The white dwarf gets hydrogen from its companion (a star) and develops accretion disk around it. |
| What happens when a hydrogen gas falls onto a white dwarf's surface? | The white dwarf will light up as a novae. |
| What is a difference between a novae and a supernovae? | A novae is much dimmer in the sky than a supernovae. |
| Altough a white dwarf doesn't shine much in visible and infrared light, it shines in ________ and ________. | Ultraviolet and X-Rays light |
| What happens if we bring a sample of a white dwarf to Earth? | It will sink through the surface because it is very dense. |
| What is a limit to a white dwarf? (* It is also known as the Chandraesekhar limit) | 1.4 Mass times the Sun |
| If there is no friction, the accretion disk will ___________ | Orbit indefinitely |
| As the materials encircles around the white dwarf, they eventually become __________ due to higher orbital speed. | Hotter |
| How does the white dwarf shine as a nova when hydrogen gas falls onto its surface? | The high temperature begins hydrogen fusion in the layer . |
| When a white dwarf shines as a novae, accreted matter ____________ | Blast into space |
| What is a neutron star? | A dead corpse of a high-mass star; ball of neutrons that is left over from a supernova. |
| What keeps a neutron star from being crushed by gravity? | Neutron degeneracy pressure |
| How are neutron stars and white dwarves similar? | They are very dense and have strong gravity |
| Pulsars are ..... | Neutron stars |
| How do pulsars come out of neutron stars? | Their fast rotation strengthens its magnetic fields and send out a beam of radiation. |
| Though pulsars are neutron stars, can all neutron stars be pulsars as well? | No |
| If a white dwarf spins as fast as a neutron star, | It will break apart. |
| When a white dwarf approaches the Chandraesekhar limit and began fusing carbon, it will become ....... | White dwarf supernova |
| Although a white dwarf novae fuses hydrogen and leaves the dwarf intact, the white dwarf supernova ______________ | Is a complete explosion of a white dwarf, leaving nothing there. |
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