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SSP

(simple stellar population, single stellar population, single-metallicity stellar population)
(set of stars born at the same time with the same metallicity)

The abbreviation SSP ( for simple stellar population or single stellar population or single-metallicity stellar population) means stars born the same time, with the same metallicity, presumably from the same molecular cloud. These would be the stars of a particular stellar cluster. The term SSP is commonly used in models of the evolution and demographics of such groups of stars, which are used to interpret observation.


(stars,star clusters)
https://www.astro.umd.edu/~richard/ASTRO620/SSP.pdf
https://www.astro.umd.edu/~richard/ASTRO620/stellarpops11_lec1.pdf
https://astronomy.swin.edu.au/cosmos/S/Single+Stellar+Populations
http://www.iac.es/preprints/files/PP10028.pdf

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