Stars/Dwarfs/Quiz

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.

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Quiz
{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 { D (i) }. a helium-rich atmosphere, indicated He I spectral lines { B (i) }. spectral lines are insufficiently clear to classify { F (i) }. no strong spectral lines { C (i) }. a metal-rich atmosphere { G (i) }. a carbon-rich atmosphere { E (i) } a hydrogen-rich atmosphere { A (i) }.
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{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 { D (i) }. supergiants { B (i) }. white dwarfs { H (i) }. main-sequence { F (i) }. bright giants { C (i) }. subdwarfs { G (i) }. subgiants { E (i) } hypergiants { A (i) }.
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{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
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{True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs. - TRUE + FALSE
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{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
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{True or False, BI 253 is an O2V star in the Large Magellanic Cloud. + TRUE - FALSE
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{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
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{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
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{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"
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{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
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Hypotheses

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