Pop I POP II thiab Pop III hnub qub yog dab tsi?
Pop I POP II thiab Pop III hnub qub yog dab tsi?

Video: Pop I POP II thiab Pop III hnub qub yog dab tsi?

Video: Pop I POP II thiab Pop III hnub qub yog dab tsi?
Video: Leng Yang - Yog Vim Dab Tsi (Official Full Song | Nkauj Tawm Tshiab) 2020/05/24 2024, Kaum ib hlis
Anonim

Pej xeem III ( Pop III ) hnub qub Nws yog tsim los ntawm cov roj ntsha tseem ceeb - hydrogen, helium thiab tsawg heev ntawm lithium thiab beryllium. Cov no Pop III hnub qub ces yuav tsim cov hlau pom nyob rau hauv Pop II star thiab pib maj mam nce hauv metallicity nyob rau tiam tom ntej ntawm hnub qub.

Tsis tas li ntawd, dab tsi yog qhov txawv ntawm pop I thiab Pop II hnub qub?

Cov pejxeem Kuv hnub qub suav nrog tus hnub thiab zoo li yuav luminous, kub thiab hluas, concentrated hauv disks ntawm kauv galaxies. Population II hnub qub zoo li yuav pom nyob rau hauv globular pawg thiab tus nucleus ntawm lub galaxy. Lawv zoo li qub, tsis tshua muaj luminous thiab txias dua Cov pejxeem Kuv hnub qub.

Qhov thib ob, cov hnub qub twg yog hlau nplua nuj? Piv txwv li, hnub qub thiab nebulae nrog cov nplua nuj ntawm carbon, nitrogen, oxygen, thiab neon yog hu ua " hlau - nplua nuj " hauv cov ntsiab lus astrophysical, txawm tias cov ntsiab lus tsis yog hlau hauv chemistry.

Ib yam li ntawd, POP 2 hnub qub yog dab tsi?

Cov pejxeem II . Hnub qub pom nyob rau hauv galaxies yog Ameslikas muab faib ua ob cov pej xeem los ntawm Walter Baade hauv 1940s. Pop II star yog cov hlau tsis zoo, nrog cov metallicities xws li kwv yees li 1/1000th mus rau 1/10th ntawm lub hnub (piv txwv li los ntawm [Z/H]=-3.0 txog [Z/H]=-1.0).

Cov pej xeem 2 lub hnub qub nyob qhov twg hauv Milky Way?

RR Lyrae hloov pauv hnub qub thiab lwm yam Population II hnub qub yog pom nyob rau hauv lub halos ntawm kauv galaxies thiab nyob rau hauv lub globular pawg ntawm lub Milky Way qhov system.

Pom zoo: