M31中的恒星观测与研究进展

Stellar Observation and Research Progress in M31

仙女座星系又称M31,是本星系群中最大的旋涡星系,它距离我们银河系约770 kpc。M31的累积视星等为3.44 mag,M31中的恒星数量大约为1012个。简要回顾了对M31当中恒星观测的发展历程,介绍了M31本地观测坐标系的建立和M31成员星的证认方法;总结了近年来在M31恒星观测上的进展并分析了其中的一些成果;最后讨论了未来的可行科学目标和LAMOST巡天计划在M31恒星观测方面可以做的工作。

Andromeda, also known as M31, is the largest spiral galaxy in the Local Group which locates in the Andromeda constellation. The distance from M31 to the Milky Way is 770 kpc, i.e. about 2.5 million light years. The integrated apparent magnitude of M31 is 3.44 mag. It is the farthest deep-sky object which can be seen by eye. The number of stars in M31 is about 1012. We give a brief review of progress in observing in M31, including photometric and spectroscopic observations in the past few decades. Then we introduce the founding of M31 observation coordinate system and the usage of this system in M31 star observations. Afterwards, we conclude how to use the radio velocity method and the color index method to separate the M31 stars from the Milky Way foreground contaminations. We then summarize the progress in recent years on the observation of M31 stars, we also analyze the results of UBVR photometric surveys, spectral observation with KECK telescope, the Local Group Galaxies Survey project, the observation of M31 diffuse interstellar band and the fitting of M31 halo＇s surface brightness function. Finally, we discuss what LAMOST can do for M31 studies in the future, for instance, identify the supergiant stars in M31 disk and analyze the radial gradient of the element abundance in M31 disk. We also proposed some possible scientific targets for future work.