Stars/Blues/Quiz

Blue stars is a lecture from the radiation astronomy department for the star courses.

You are free to take this quiz based on blue stars at any time.

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Quiz
{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 the color index? + a simple numerical expression + the magnitude of an object + a set of passbands or filters - brightenings + UBVRI filters + particular combinations of glass filters and photomultiplier tubes
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{True or False, Hydrogen has an emission line in the blue. - TRUE + FALSE
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{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
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{Yes or No, Helium has an emission line in the blue. + Yes - No
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{Which series of emission lines from hydrogen often occur in the visible spectrum of a star? - Paschen series - Brackett series - Pfund series - Lyman series - Humphreys series - Rydberg series + Balmer series
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{True or False, Lithium has an emission line in the blue. + TRUE - FALSE
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{Which of the following is not a spectral class B star? - Spica + Tau Canis Majoris - Bellatrix - Rigel - Regulus - Achernar
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{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 is not a spectral class A star? - Sirius A - Vega + Bellatrix - Deneb - Altair - Fomalhaut
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{True or False, Beryllium has an emission line in the blue. + TRUE - FALSE
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{ What is the blue-radiation source [hint: planet] in the image at right? { Earth (i) }
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{True or False, Boron has an emission line in the blue. + TRUE - FALSE
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{Observations of comets have benefited greatly from what phenomenon of cyan astronomy? - Cherenkov radiation - the electric blue glow of lightning - gas-expansion velocity decreases with increasing heliocentric distance - methane possesses prominent absorption bands in the visible - adaptive optics + the light of the neutral CN-radical
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{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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{Which of the following is not a spectral class O star? - Alpha Camelopardalis - Tau Canis Majoris - Plaskett's star + Sirius A - Pistol Star - Zeta Puppis
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{True or False, Carbon has an emission line in the blue. + TRUE - FALSE
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{Which of the following are characteristic of interstellar extinction? + redder color indices - closer stars more affected + color excess + observed color index minus intrinsic color index - red shift - blue shift
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{True or False, The red shift cannot affect blue stars. - TRUE + FALSE
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{True or False, Nitrogen has an emission line in the blue. + TRUE - FALSE
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{Which of the following are theoretical radiation astronomy phenomena associated with the Earth? - a core which emits neutrinos - a charged particle wind which emanates out the polar ionosphere holes + gravity + near the barycenter for the Earth-Moon system + the swirls of tan, green, blue, and white are most likely sediment in the water - coronal clouds + chlorophyll-containing phytoplankton aloft in the upper atmosphere
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{True or False, Oxygen has an emission line in the blue. + TRUE - FALSE
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{Which of the following are radiation astronomy phenomena associated with the gaseous-object Neptune? - Voyager 2 + blue rays + clouds - neutron emission - polar coronal holes + meteor emission - rotation
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{True or False, Fluorine has an emission line in the blue. + TRUE - FALSE
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{True or False, Neon has an emission line in the blue. + TRUE - FALSE
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{Which of the following are theoretical radiation astronomy phenomena associated with a wanderer? + possible orbits + a charged particle wind + gravity + near the barycenter of its system - swirls of tan, green, blue, and white in the liquid methane + electric arcs + chlorophyll-containing phytoplankton aloft in an upper atmosphere
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{Complete the text: Match up the blue object with the possibilities below: Sun - H Mercury - I Venus - J Earth - K Meteorite on Mars - L Pallas - M Comet Holmes - N Europa - O Io - P Saturn - Q Enceladus - R Tethys - S Titan - T Neptune - U Abell 370 - V SN 1987A - W Crab Nebula - X { T (i) }. { H (i) }. { N (i) }. { M (i) }. { S (i) }. { X (i) }. { O (i) }. { J (i) }. { V (i) }. { K (i) }. { R (i) }. { W (i) }. { Q (i) }. { L (i) }. { U (i) }. { I (i) }. { P (i) }.
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{True or False, Any small luminous blue dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots is most likely to be an active galactic nucleus. - TRUE + FALSE
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Hypotheses

 * 1) Blue astronomy of blue stars captures unique events not available at other wavelength bands.