Population I

alternative population I

1. attributiveusuallyastrophysicsA population or group of stars formed relatively late in the history of the Universe, characterized by having a high metallicity.

   Most stars, such as the sun, are third-generation "Population I" stars that contain relatively heavy elements such as iron, nickel, carbon and oxygen.

   2021 May 21, Tom Metcalfe, “An ancient star casts new light on the birth of the universe”, in NBC News, archived from the original on 06 Jul 2022

   2 more examples

   We generally place stars into one of three populations based on their metallicity. Population I stars like the Sun are metal heavy. They are younger stars and tend to be found in the spiral arms of the Milky Way.

   2019 December 11, Brian Koberlein, “The Stars In Our Galaxy Are More Varied Than We Thought”, in Forbes, archived from the original on 15 Sep 2022

   The brightness of these galaxies could be attributed to such stars, which would be much hotter and brighter than subsequent Population II stars and Population I stars, such as our sun, both of which fill our modern-day universe.

   2022 December 6, Jonathan O'Callaghan, “Astronomers Grapple with JWST’s Discovery of Early Galaxies”, in Scientific American, archived from the original on 09 Dec 2022

1. Alternative letter-case form of Population I.