Population II

alternative population II

1. attributiveusuallyastrophysicsA population or group of stars formed early in the history of the Universe, characterized by having a low metallicity.

   While the thick disk is largely composed of Population II stars, they found it contains two stellar populations.

   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

   2 more examples

   Those heavy elements were created by fusion within Population II stars that exploded as supernovas and seeded them into interstellar clouds.

   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

   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 II.