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1. en.wikipedia.org › wiki › Stellar_classificationStellar classification - Wikipedia

   en.wikipedia.org › wiki › Stellar_classification

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   20 hours ago · Stellar classification. In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines.

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   What are a-type stars?

   • Spectral standards: A-type stars are among the more common naked eye stars, and are white or bluish-white. They have strong hydrogen lines, at a maximum by A0, and also lines of ionized metals ( Fe II, Mg II, Si II) at a maximum at A5. The presence of Ca II lines is notably strengthening by this point.

   Stellar classification - Wikipedia

   en.wikipedia.org/wiki/Stellar_classification

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   How are stars classified?

   • Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest ( O type) to the coolest ( M type). Each letter class is then subdivided using a numeric digit with 0 being hottest and 9 being coolest (e.g., A8, A9, F0, and F1 form a sequence from hotter to cooler).

   Stellar classification - Wikipedia

   en.wikipedia.org/wiki/Stellar_classification

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   How many B-type stars are in the solar neighborhood?

   • About 1 in 800 (0.125%) of the main-sequence stars in the solar neighborhood are B-type main-sequence stars. [c] B-type stars are relatively uncommon and the closest is Regulus, at around 80 light years.

   Stellar classification - Wikipedia

   en.wikipedia.org/wiki/Stellar_classification

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