Stars/Violets/Quiz

Violet stars is a lecture and an article about the astronomy of stars.

You are free to take this quiz based on violet 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 template. This should give you adequate background to get 100 %.

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Quiz
{True or False, Regulus is a likely first violet source in Leo. + TRUE - FALSE
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{Complete the text: Match up the violet or violet containing image with the object letter: Sun - A Venus - B Earth - C Moon - D Mars - E Jupiter - F Ganymede - G Io - H Saturn - I Dione - J Titan - K Uranus - L Ariel - M Miranda - N Triton - O Eta Carinae - P NGC 5584 - Q { N (i) }. { K (i) }. { O (i) }. { J (i) }. { I (i) }. { E (i) }. { Q (i) }. { F (i) }. { P (i) }. { B (i) }. { H (i) }. { L (i) }. { D (i) }. { G (i) } { C (i) }. { A (i) }. { M (i) }.
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{True or False, α Sagittarii may be the first detected UV source in the constellation Sagittarius. + TRUE - FALSE
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{Yes or No, The “Purple Haze” is a diffuse blueish/purple glow within a few arcseconds of the central star in HST images of the Homunculus. + Yes - No
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{True or False, Violet stars have radiation that peaks over the wavelength band 380-450 nm. + TRUE - FALSE
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{Which of the following are phenomena associated with violet stars? - photographs of the planet Venus taken in 1927 + the purple haze within a few arcseconds of the central star of the Homunculus + the faintness of carbon stars + the stellar abundance of aluminum - adaptive optics - the helium beta line
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{Helium has emission lines in which of the following colors? + violet + blue + cyan + green + yellow - orange + red
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{Hydrogen has emission lines in which of the following colors? + violet - blue + cyan - green - yellow - orange + red
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{Yes or No, Stellar class O stars have surface temperatures high enough that most of their luminescence is in the ultraviolet. + Yes - No
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{Complete the text: Match up the radiation letter with each of the detector possibilities below: Optical rays - L Visual rays - M Violet rays - N Blue rays - O Cyan rays - P Green rays - Q Yellow rays - R Orange rays - S Red rays - T multialkali (Na-K-Sb-Cs) photocathode materials { L (i) }. F547M { Q (i) }. F675W { T (i) }. broad-band filter centered at 404 nm { N (i) }. F588N { R (i) }. thallium bromide (TlBr) crystals { O (i) }. F606W { S (i) }. 18 micrometers FWHM at 490 nm { P (i) }. wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO) { M (i) }.
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Hypotheses

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