Stars/Os/Quiz

O stars is a lecture about an entity, source, and/or object observed using radiation astronomy that is classified as an O-type star.

You are free to take this quiz based on O stars. Once you've read and studied it, the links contained within, listed under See also, External links and the template, you should have adequate background to score 100 %.

Enjoy learning by doing!

Quiz
{O stars can be put into classes based on? + luminosity + size + apparent mass + temperature + spectral lines + composition
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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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{Which of the following is not a characteristic of O type stars? - can be a spectroscopic binary - the hottest stars - can be a high-velocity star - peak wavelength in the gamma-ray range + orange color.
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{True or False, Alnitak is a triple star system with an O9.7 supergiant and an O9 giant as well as a B0 giant. + TRUE - FALSE
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{True or False, Spectroscopically Zeta Puppis is classified as O4 I. + TRUE - FALSE
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{True or False, BI 253 is an O2V star in the Large Magellanic Cloud. + TRUE - FALSE
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{Gamma-ray stars have surface temperatures starting at 300,000,000 K (300 MK) corresponding to a peak wavelength of 0.010 nm (10 pm) for the beginning of super soft { gamma-ray (i) } sources.
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{True or False, X-ray stars have surface temperatures starting at 300,000 K corresponding to a peak wavelength of 10 nm for the beginning of super soft X-ray sources. + TRUE - FALSE
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{Which of the following is not a phenomenon usually associated with O-type SN progenitors? - a blue supergiant - an LBV + a red supergiant - an early W-R - a WN
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{Complete the text: On the main sequence for spectral classes 06-06.5, 07, and 08 one finds strong { He II (i) } λ4686 absorption often accompanied by weak { Ν III (i) } λλ4634-4640-4642 emission.
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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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Hypotheses

 * 1) Stars that emit light do so because they are receiving electron irradiation.