Population I
E459057
Population I stars are relatively young, metal-rich stars typically found in the disks and spiral arms of galaxies.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Population I stars | 1 |
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical concept
ⓘ
stellar population class ⓘ |
| alsoKnownAs | Population I stars ⓘ |
| associatedWith |
H II regions
ⓘ
molecular clouds ⓘ open star clusters ⓘ star-forming regions ⓘ |
| characteristicAge | relatively young stars ⓘ |
| classificationCriterion | chemical composition and kinematics ⓘ |
| conceptIntroducedIn | 20th century astrophysics ⓘ |
| contains |
many B-type stars
ⓘ
many massive O-type stars ⓘ young main-sequence stars ⓘ |
| contrastedWith |
Population II stars
ⓘ
Population III stars ⓘ |
| definedBy | high abundance of elements heavier than helium ⓘ |
| formationEnvironment | gas-rich regions ⓘ |
| foundIn |
barred spiral galaxies
ⓘ
spiral galaxies ⓘ |
| importantFor |
chemical evolution of galaxies
ⓘ
understanding spiral arm structure ⓘ |
| includes | the Sun NERFINISHED ⓘ |
| kinematics | nearly circular orbits around galactic center ⓘ |
| metallicity | metal-rich ⓘ |
| metallicityComparedToSun | similar to or higher than solar metallicity ⓘ |
| metallicityIndicator | strong metal absorption lines in spectra ⓘ |
| metalRicherThan | Population II NERFINISHED ⓘ |
| observedIn |
Andromeda Galaxy (M31)
NERFINISHED
ⓘ
Milky Way NERFINISHED ⓘ other nearby spiral galaxies ⓘ |
| oftenHosts | planetary systems ⓘ |
| oftenLocatedNear | galactic plane ⓘ |
| rareIn |
elliptical galaxies
ⓘ
galactic halo ⓘ |
| spectralTypesCommon | O, B, A, F, G, K, M main-sequence stars ⓘ |
| subdividedInto |
Population I (young thin-disk stars)
ⓘ
intermediate Population I ⓘ |
| traces | recent star formation ⓘ |
| typicalAgeRange | tens of millions to a few billion years ⓘ |
| typicalLocation |
Milky Way thin disk
NERFINISHED
ⓘ
galactic disk ⓘ spiral arms of galaxies ⓘ |
| typicalMetallicityRange | about Z ≈ 0.01–0.03 ⓘ |
| usedIn | galactic population synthesis models ⓘ |
| velocityDispersion | relatively low ⓘ |
| youngerThan | Population II NERFINISHED ⓘ |
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Population I stars
subject surface form:
NGC 6530