摘要
Mass of open duster NGC 7789 in the Galaxy is determined by three methods： the photometric method based on mass-luminosity relations of stars in the duster Mpho= 7712.5M⊙; the dynamical method based on virial theorem Mvir=6996.1M⊙; and the tidal radius method based on the interaction between the cluster and the Galaxy Mtid= 5152.5M⊙. The mean mass of this cluster is estimated to be Mc =6620.4 4- 762.5M⊙.
Mass of open duster NGC 7789 in the Galaxy is determined by three methods： the photometric method based on mass-luminosity relations of stars in the duster Mpho= 7712.5M⊙; the dynamical method based on virial theorem Mvir=6996.1M⊙; and the tidal radius method based on the interaction between the cluster and the Galaxy Mtid= 5152.5M⊙. The mean mass of this cluster is estimated to be Mc =6620.4 4- 762.5M⊙.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10473012, 10573020, 10633020, 10673012, 10603006, 10778720, 10873016 and 10803007, the National Basic Research Programme of China under Grant No 2007CB815403, and the Knowledge Innovation Program of the Chinese Academy of Sciences.
