Subdwarf

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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At a glance

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Notion

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Science and technology

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What Wikipedia says

A subdwarf, sometimes denoted by "sd", is a star with luminosity class VI under the Yerkes spectral classification system. They are defined as stars with luminosity 1.5 to 2 magnitudes lower than that of main-sequence stars of the same spectral type.

Excerpt from the Wikipedia article “Subdwarf”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: User:Spacepotato, CC BY-SA 3.0, via Wikimedia Commons.