Radiation astronomy/Hypervelocity stars/Quiz

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ι Orionis is the bright star to the right (south) of the Orion Nebula. Credit: Rawastrodata.

Hypervelocity stellar astronomy is a lecture about the astrophysics of hypervelocity stars.

You are free to take this quiz based on hypervelocity stellar astronomy at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the {{Principles of radiation astronomy}} template. This should give you adequate background to get 100 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

Suggestion: Have the lecture available in a separate window.

To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!

Quiz[edit | edit source]


1 Complete the text:

Match up the item letter with each of the possibilities below:
Einstein ring - A
stellar nebula - B
Andromeda galaxy - C
Triplet galaxies interacting - D
Hubble galaxies - E
Dark matter halo simulation - F
Fairall 9 (Seyfert galaxy in X-rays) - G
Tycho Brahe observatory, remotely controlled telescope, captured galaxy - H
Andromeda's Colorful Rings.jpg


A Horseshoe Einstein Ring from Hubble.JPG

SWIFT J0123.9-5846 Hard X-ray.jpg

Dark matter halo.png

AmCyc Nebula - Stellar Nebula.jpg

Dorian Gray.jpg

Cosmic Interactions.jpg


2 Which of the following are radiation astronomy phenomena associated with a star?

ultraviolet emission
X-ray emission
gamma-ray emission
neutron emission
7Be emission
meteor emission

3 Which of the following is not a spectral class B star?

Tau Canis Majoris

4 Which of the following is not a spectral class A star?

Sirius A

5 True or False, An O class star is not hot enough on the surface of its photosphere to emit X-rays.


6 Which of the following are associated with classical Cepheids as a standard candle?

characteristic mottling
young, disk objects
recent star formation
incipient resolution
pulsation phenomenon
easy to recognize
correction for absorption

7 True or False, To date, all of the reported hypervelocity stars (HVSs), which are believed to be ejected from the Galactic center, are blue.


8 Complete the text:

Match up the object viewed in the ultraviolet with its image:
Sun's chromosphere- L
calcite - M
Venus - N
Jupiter's aurora - O
Jupiter - P
Io - Q
Saturn - R
Betelgeuse - S
Mira - T
LAB-1 - U
Messier 101 - V


Mira the star-by Nasa alt crop.jpg


Aurora Saturn.jpg


Lyman-alpha blob LAB-1.jpg

Betelgeuse star hubble-580x580.jpg

Hubble Space Telescope Image of Fragment BDGLNQ12R Impacts.jpg

Calcite LongWaveUV HAGAM.jpg

M101 UIT.gif


9 True or False, The red shift cannot affect blue stars.


10 Complete the text:

Match up the likely type of star fission with each of the possibilities below:
a triple-component stellar multiple - A
massive star fission - B
semidetached binary - C
a separating close contact binary - D
ZAMS system - E
tight, circular orbit, impossible to tell eclipses - F
lobate star - G
coronal mass ejection - H
BH Centauri

Plaskett's Star (HR 2422)


W Ursae Majoris

Beta Lyrae

V1010 Ophiuchi

object is confirmed to be co-moving



11 Yes or No, A clumpiness in the galactic halo is through a spatially continuous elevation in the density of dark matter, rather than the more realistic discrete distribution of clumps.


12 True or False, Cosmological redshift is seen due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase of their distance from Earth.


13 Which of the following is not a spectral class O star?

Alpha Camelopardalis
Tau Canis Majoris
Plaskett's star
Sirius A
Pistol Star
Zeta Puppis

14 Complete the text:

Match up the white dwarf classification with its distinctive characteristic:
DA - A
DB - B
DC - C
DO - D
DQ - E
DX - F
DZ - G
a helium-rich atmosphere, indicated He II spectral lines

a helium-rich atmosphere, indicated He I spectral lines

spectral lines are insufficiently clear to classify

no strong spectral lines

a metal-rich atmosphere

a carbon-rich atmosphere

a hydrogen-rich atmosphere


15 Complete the text:

Match up the approximate luminosity class with each of the stellar class possibilities below:
0 - A
I - B
II - C
IV - E
V - F
VI - G


white dwarfs


bright giants





16 Complete the text:

Match up the effective temperature with its spectral class:
O - A
B - B
A - C
F - D
G - E
K - F
M - G
L - H
T - I
Y - J
7,000 K

2,000 K

15,000 K

4,000 K

400 K

9,000 K

3,000 K

5,500 K

45,000 K

1,000 K


17 Which of the following are theoretical radiation astronomy phenomena associated with a star?

possible orbits
a hyperbolic orbit
nuclear fusion at its core
nuclear fusion in its chromosphere
near the barycenter of its planetary system
electric arcs
impact craters
radar signature

Hypotheses[edit | edit source]

  1. The current metallicity of a star may depend on the presence of coronal clouds.

See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}