Population I
English
Alternative forms
- population I
Etymology
Proposed by astronomer Walter Baade in 1944.
Proper noun
Population I
- (astrophysics, usually attributively) A population or group of stars formed relatively late in the history of the Universe, characterized by having a high metallicity.
- Coordinate terms: Population II, Population III
- 2019 December 11, Brian Koberlein, “The Stars In Our Galaxy Are More Varied Than We Thought”, in Forbes, archived from the original on 2022-09-15:
- 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.
- 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 2022-07-06:
- Most stars, such as the sun, are third-generation "Population I" stars that contain relatively heavy elements such as iron, nickel, carbon and oxygen.
- 2022 December 6, Jonathan O'Callaghan, “Astronomers Grapple with JWST’s Discovery of Early Galaxies”, in Scientific American, archived from the original on 2022-12-09:
- 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.
Derived terms
- Pop I (abbreviation)