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In 1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations. In the abstract of the article by Baade, he recognizes that Jan Oort originally conceived this type of classification in 1926.
Art, Chemical classification by Walter Baade & Stellar development
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stars population iii ii metallicity star stellar observed elements sun galaxy first universe metals found high metal also formation chemical
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| oxygen.By definition | instance of | including chemical non-metals | 0.80 | text |
| each population group shows the trend where lower metal content indicates higher age of stars | instance of | including chemical non-metals | 0.80 | text |
| lithium | instance of | with only a very tiny fraction consisting of other light elements | 0.80 | text |
| beryllium | instance of | with only a very tiny fraction consisting of other light elements | 0.80 | text |
| HE 0107-5240 | instance of | possibly even in our Milky Way galaxy.Analysis of data of extremely low-metallicity population II stars | 0.80 | text |
| which are thought to contain the metals produced by population III stars | instance of | possibly even in our Milky Way galaxy.Analysis of data of extremely low-metallicity population II stars | 0.80 | text |
| suggest that these metal-free stars had masses of 20 | instance of | possibly even in our Milky Way galaxy.Analysis of data of extremely low-metallicity population II stars | 0.80 | text |
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