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Stars/Novas/Quiz

< Stars‎ | Novas

Novas is a lecture about an entity, source, and/or object observed using radiation astronomy.

Light curves are compared to normal supernovae. Credit: Lithopsian.

You are free to take this quiz based on novas. Once you've read and studied it, the links contained within, listed under See also, External links and the {{stars resources}} template, you should have adequate background to score 100 %.

Suggestion: Have the lecture available in a separate window.

Enjoy learning by doing!

Quiz edit

  

1 Which of the following are radiation astronomy phenomena associated with novas?

ultraviolet emission
X-ray emission
gamma-ray emission
optical emission
broken synchronism
circular polarization

2 Yes or No, A hypernova is a type of stellar explosion with a luminosity 10 or more times higher than that of standard supernovae.

Yes
No

3 Which of the following is not a characteristic of a nova?

only irregular small-scale brightness changes
occasional drops in luminosity
accretion disks
white dwarfs possess magnetic fields of appreciable strength
a surface spot coverage of at least 95%.

4 Gas around V838 Monocerotis, nova-like star, seemed to be expanding

from Earth.

5 True or False, A nova is a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months.

TRUE
FALSE

6 UX Ursae Majoris as a star has what spectroscopic properties?

orbital light curve similar to DQ Her
its orbital period is longer than DQ Her by only 5 minutes
shape of the eclipse is similar to DQ Her
hump near to the eclipse is similar to DQ Her
it has a surface temperature of ~700 K
it's an X-ray source

7 Complete the text:

A recurrent nova is produced by a

dwarf star and a red

circling about each other in a

orbit.

8 True or False, Novae are relatively common in the Andromeda galaxy (Messier 31).

TRUE
FALSE

9 When magnetic stars are present, what characteristics are readily observed?

same brightness changes as non-magnetic nova-like stars
bright accretion disk
matter swirling along field lines
some flow velocities come from magnetically channeled plasma
appear to be much more prevalent than non-magnetic stars
neon clouds

10 A luminous red nova is a stellar explosion thought to be caused by the merger of

stars.


Hypotheses edit

Main article: Hypotheses
  1. Stars that emit light do so because they are receiving electron irradiation.
  2. Nova-like activity in stars may be due to a larger star companion.

See also edit

External links edit

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