The wikipedia article about horizontal branch stars says:

A related class of stars is the clump giants, those belonging to the so-called red clump, which are the relatively younger (and hence more massive) and usually more metal-rich population I counterparts to HB stars (which belong to population II).

Whereas the article about the red clump says:

The red clump giants are cool horizontal branch stars

This image below also suggests that red clump stars are horizontal branch stars. Is this assessment corrent, and so is the first wikipedia article wrong to suggest that red clump stars are not themselves (but "counterparts to") HB stars?

enter image description here

  • 1
    $\begingroup$ I suppose this might be an instance of conflicting terminology; red clump stars are really a specific subtype of HB stars in general, but sometimes the term "HB stars" is also used to refer to those which are specifically not red clump stars, as in your first quote. $\endgroup$
    – YiFan
    May 29, 2021 at 1:32


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