Radiation astronomy/Stars/Quiz

Stellar radiation astronomy is a lecture about the astrophysics of stellar radiation.

The diffuse X-ray emission from Chandra is colored purple and the optical emission from the Hubble Space Telescope is colored red, green, and blue. Credit: J. Kastner, et al.{{fairuse}}

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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









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 Green astronomy may help to detect what type of astronomical object?

a stellar class G dwarf
the hydrogen Balmer alpha line
the photosphere of the Sun
extrasolar planets
the CMB

4 Red-giant stars have (or theoretically may have) these in common:

potential 22Ne
helium-burning shells
non-standard neutrino losses
Lithium red line
N stars display F abundances up to 30 times the solar system value
RGB and AGB stars
a radius between 200 and 800 times that of the Sun

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











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 Complete the text:

Match up the item letter with each of the possibilities below:
X-ray burster - A
gamma-ray burster - B
X-ray pulsar - C
soft X-ray transient - E
diffuse X-ray background - F
power law afterglow

magnetized neutron star

absorbed by neutral hydrogen

Aquila X-1

Factor of 10 or greater luminosity increase

thermal bremsstrahlung


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

18 Yes or No, Below EeV energies ultra high energy neutrons have boosted lifetimes.



  1. The current metallicity of a star may depend on the presence of coronal clouds.
  2. High-energy electrons impinging on the surface of a star determine its temperature.

See alsoEdit

External linksEdit

{{Radiation astronomy resources}}{{Stars resources}}