closed subgroup 中文意思是什麼
closed subgroup
解釋
閉子群-
The calculating results show : ( 1 ) most of samples are located in 5 kpc - 10 kpc from galactic center. all of the sample clusters present a spherical symmetrical distribution around the galactic center, and their space velocities are presented a ellipsoidal distribution ; ( 2 ) according to the metallicity and basic characters, the sample clusters are separated into hb subgroup and mp subgroup. the number of samples are changed with metallicity [ fe / h ], and there is a peak at [ fe / h ] = - 1. 6 ; ( 3 ) the orbits of sample clusters show mostly limited, periodic characteristics, but the orbits are not closed completely, their maximal galactocentric distance is less than 40 kpc
計算結果表明： （ 1 ）大部分樣本星團都位於銀心距5kpc 10kpc的范圍內，相對于銀心呈球對稱分佈，它們的速度也呈橢球分佈； （ 2 ） 29個樣本星團按其金屬度大小和基本性質分類，可分屬hb和mp兩個球狀星團次系，且樣本星團數隨金屬度[ fe h ]而變化，在[ fe h ] = - 1 . 6處出現一個峰值； （ 3 ）所有樣本星團的軌道運動都呈周期性，大都在一個有界而不封閉的周期軌道上運動，其最大銀心距都在40kpc以內。
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