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Stars/Dwarfs/Quiz

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File:DH 72.jpg
An image of DH Tau's companion is at 2.2 μm. Credit: Yoichi Itoh, Kobe University.

Dwarf stars is a lecture about the dwarf classes of stars.

You are free to take this quiz based on dwarf stars 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 {{stars resources}} template. This should give you adequate background to get 100 %.

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Quiz

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1 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

.

2 Complete the text:

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

.
supergiants

.
white dwarfs

.
main-sequence

.
bright giants

.
subdwarfs

.
subgiants

hypergiants

.

3 Imaging brown dwarfs involve which of the following:

far-infrared (submillimeter) observations at 350 microns
neutrino detection
heating of the nearby gas and dust
near-infrared covering 1.3 and 2.2 microns
infrared covering 4.5 and 8.0 microns

4 True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs.

TRUE
FALSE

5 Phenomena associated with some brown dwarfs are which of the following?

lithium
a temperature well below the stellar range
methane absorption
the lithium test
X-rays
T dwarfs

6 True or False, BI 253 is an O2V star in the Large Magellanic Cloud.

TRUE
FALSE

7 Which of the following is not a phenomenon associated with green astronomy?

a stellar class G dwarf
the hydrogen Balmer beta line
the photosphere of the Sun
an emission with a wavelength of 618 nm
"ionization cones"
boron ion emission

8 Radiation astronomy may help to detect what type of astronomical object?

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

9 Which of the following is not a phenomenon associated with red astronomy?

a stellar class M dwarf
the hydrogen Balmer alpha line
the photosphere of the Sun
an emission with a wavelength of 618 nm
lithium
"cometary knots"

10 Infrared astronomy has really helped to detect what type of astronomical object?

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


Hypotheses

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Main resource: Hypotheses
  1. The current metallicity of a star may depend on the presence of coronal clouds.

See also

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{{Radiation astronomy resources}}

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