球状星团M4的动力学质量

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英文篇名：Dynamical Mass of the Globular Cluster M4 作者：高新华 ; 徐守坤 ; 顾晓清 ; 石林 ; 李宁 英文作者：GAO Xinhua;XU Shoukun;GU Xiaoqing;SHI Lin;LI Ning;School of Information Science and Engineering,Changzhou University; 关键词：球状星团 ; M4 ; 视向速度 ; 位力定理 英文关键词：globular cluster;;M4;;radial velocity;;the virial theorem 中文刊名：JSSY 英文刊名：Journal of Changzhou University(Natural Science Edition) 机构：常州大学信息科学与工程学院; 出版日期：2017-11-28 出版单位：常州大学学报(自然科学版) 年：2017 期：v.29;No.117 基金：国家自然科学基金资助项目(11403004) 语种：中文; 页：JSSY201706014 页数：5 CN：06 ISSN：32-1822/N 分类号：96-100

摘要

M4(NGC 6121)是离太阳最近的一个球状星团,是研究各种天体物理问题的重要实验室。质量是球状星团的重要物理量,对于研究星团的动力学演化历史有重要意义。由于球状星团中有大量不可见物质(白矮星、中子星、黑洞),给质量的估算带来一定麻烦,本文基于M4中851颗单星成员的高精度视向速度数据分析了星团的内禀速度弥散度,再根据位力定理计算出M4的动力学质量为8.59×10~4M⊙,文中的动力学质量已经包含了不可见物质的质量。
        M4(NGC 6121)is the nearest globular cluster,which is an important labortory for studying many problems in astrophysics.Mass is an important parameter for globular clusters,which can be used to analyze the dynamical evolution of globular clusters.The mass estimation of a globular cluster usually suffers from a large amount of invisible matters such as white drawfs,neutron stars and black holes.This paper presents an estimate for the dynamical mass of M4 based on high-precision radial velocities and the virial theorem.The cluster dynamical mass is determined to be 8.59×10~4 M⊙based on 851 single stars,which has included the mass of invisible matters.

引文

[1]詹姆斯·宾尼,斯科特·特里梅因,宾尼,等.星系动力学[M].上海:上海科学技术出版社,2005:15.
    [2]CLAUSEN D,SIGURDSSON S,CHERNOFF D F.Black hole-neutron star mergers in globular clusters[J].Monthly Notices of the Royal Astronomical Society,2013,428(4):3618-3629.
    [3]MANDUSHEV G,STANEVA A,SPASOVA N.Dynamical masses for galactic globular clusters[J].Astronomy&Astrophysics,1991,252:94-99.
    [4]HARRIS W E.A catalog of parameters for globular clusters in the milky way[J].Astronomical Journal,1996,112(4):1487-1488.
    [5]LARSEN S S,BRODIE J P,SARAJEDINI A,et al.Structural parameters and dynamical masses for globular clusters in M33[J].Astronomical Journal,2002,124(5):2615-2624.
    [6]GELLER A M,LATHAM D W,MATHIEU R D.Stellar radial velocities in the old open cluster M67(NGC 2682)I.Memberships,Binaries,and Kinematics[J].Astronomical Journal,2015,150(3):97.
    [7]MALAVOLTA L,PIOTTO G,BEDIN L R,et al.The M4core project with HST-IV internal kinematics from accurate radial velocities of 2771cluster members[J].Monthly Notices of the Royal Astronomical Society,2015,454(3):2621-2635.
    [8]张学工.模式识别[M].3版.北京:清华大学出版社,2010:56-57.
    [9]MCNAMARA B J,HARRISON T E,MCARTHUR B E,et al.The internal proper motions of stars in the open cluster M35[J].Astronomical Journal,2011,142(2):53.
    [10]HENDRICKS B,STETSON P B,VANDENBERG D A,et al.A new reddening law for M4[J].Astronomical Journal,2012,144(1):2966-2976.
    [11]HEGGIE D C,GIERSZ M.Monte carlo simulations of star clusters-V the globular cluster M4[J].Monthly Notices of the Royal Astronomical Society,2008,389(4):1858-1870.
    [12]高新华,徐守坤.利用位力定理估算球状星团的质量[J].大学物理,2017,36(1):33-36.