小学一年级英语作文:Good friend

Based on Gaia - DR2 and LAMOST - DR5 data, according to the location information of cross matching, through the LAMOST DR5 data given z, rv and Fe/h parameter to determine the cluster to speed and metallicity. A cluster of regard to speed and on their own, then determine the space velocity of the cluster. Through the metal abundance, we can explore the age of stars. So these basic quantity for many astronomical research work are very important. In this work we select members of star probability is greater than 0.5 stars, gauss curve fitting is used to derive belonging to the same cluster members of the star and average depending on the speed of metallicity, and saw it as a cluster to speed and metallicity. Make up foundation for further inquiry.