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Stars/Dwarfs/Quiz

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

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

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Quiz edit

  

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 edit

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

See also edit

External links edit

{{Radiation astronomy resources}}

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