User:Marshallsumter/Radiation astronomy2/Stars/Quiz

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

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

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Quiz
{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 { C (i) }. { H (i) }. { A (i) }. { G (i) }. { F (i) }. { B (i) }. { E (i) }. { D (i) }.
 * type="{}"}

{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
 * type="[]"}

{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 + lithium - the CMB
 * type="[]"}

{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
 * type="[]"}

{True or False, An O class star is not hot enough on the surface of its photosphere to emit X-rays. + TRUE - FALSE
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{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
 * type="[]"}

{True or False, To date, all of the reported hypervelocity stars (HVSs), which are believed to be ejected from the Galactic center, are blue. + TRUE - FALSE
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{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 { L (i) }. { Q (i) }. { T (i) }. { N (i) }. { R (i) }. { O (i) }. { U (i) } { S (i) }. { P (i) }. { M (i) }. { V (i) }.
 * type="{}"}

{True or False, The red shift cannot affect blue stars. - TRUE + FALSE
 * type=""}

{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 { D (i) }. Plaskett's Star (HR 2422) { B (i) }. Betelgeuse { G (i) } W Ursae Majoris { F (i) }. Beta Lyrae { C (i) }. V1010 Ophiuchi { E (i) } object is confirmed to be co-moving { A (i) }. Sun { H (i) }.
 * type="{}"}

{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. + Yes - No
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{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. + TRUE - FALSE
 * type=""}

{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 SFXT - D soft X-ray transient - E diffuse X-ray background - F power law afterglow { B (i) } magnetized neutron star { C (i) }. absorbed by neutral hydrogen { F (i) }. Aquila X-1 { E (i) }. Factor of 10 or greater luminosity increase { A (i) }. thermal bremsstrahlung { D (i) }.
 * type="{}"}

{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) }.
 * type="{}"}

{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) }.
 * type="{}"}

{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 { D (i) }. 2,000 K { H (i) } 15,000 K { B (i) }. 4,000 K { F (i) }. 400 K { J (i) }. 9,000 K { C (i) }. 3,000 K { G (i) }. 5,500 K { E (i) } 45,000 K { A (i) }. 1,000 K { I (i) }.
 * type="{}"}

{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 + accretion + electric arcs - impact craters - radar signature
 * type="[]"}

{Yes or No, Below EeV energies ultra high energy neutrons have boosted lifetimes. - Yes + No
 * type=""}

Hypotheses

 * 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.