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Stars/Nova-likes/Quiz

< Stars | Nova-likes

Nova-like stars is a lecture about an entity, source, and/or object observed using radiation astronomy.

"Mini Supernova" Explosion Could Have Big Impact. Credit: X-ray: NASA/CXC/RIKEN/D.Takei et al; Optical: NASA/STScI; Radio: NRAO/VLA.

You are free to take this quiz based on nova-like stars. 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

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1 Which of the following are radiation astronomy phenomena associated with a nova-like star?

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

2 Yes or No, In nova-like stars the binary system is visible.

Yes
No

3 Which of the following is not a characteristic of a nova-like star?

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, UX Ursae Majoris is a Nova-like Star.

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:

As far as

brightness changes are concerned, magnetic and

nova-like stars behave in the

.

8 True or False, That the central star in some nova-like systems has magnetic properties has nothing to do with the outburst behavior.

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 nova-like star is a close binary system with a white dwarf as a primary and a late-type main-sequence secondary star filling its

lobe.


Hypotheses

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Main resource: 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

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