标题： 比较M31盘中活动区域中的年轻恒星种群 显示英文标题

标题： Comparing Young Stellar Populations Across Active Regions in the M31 Disk

摘要： 我提供了来自NOAO/CTIO本地星系群调查数据集的M31盘区的初步BV分辨恒星测光数据。 我对M31盘区中三个当前活跃区域：OB 78、OB 102和东北旋臂内的恒星形成历史进行了详细分析。 结果表明，与其它活跃区域相比，OB 78的低H$\alpha$发射直接与这些区域近期的恒星形成历史细节有关。 此外，虽然我分析的每个活跃区域都显示出近期恒星形成活动的增加，但一些活跃区域与相邻区域相比，含有年龄小于~100 Myr的恒星密度较高。 相邻区域在过去100 Myr内表现出相对稳定且较低的恒星形成率。 活跃区域两侧的恒星种群之间没有显著差异。 这种对称性并未显示出近期恒星形成活动在这些当前活跃区域附近的明显迹象。 显示英文摘要

摘要： I present preliminary BV resolved stellar photometry of the M31 disk measured from the data set of the NOAO/CTIO Local Group Survey. I have performed detailed analyses of the star formation histories in and around three currently active regions in the M31 disk: OB 78, OB 102 and the northeast spiral arm. The results suggest that low H$\alpha$ emission from OB 78 compared to other active regions is directly related to the details of the recent star formation histories of the regions. In addition, while every active region I analyzed shows a recent increase in star formation activity, some active regions also contain overdensities of stars with ages <~100 Myr compared to adjacent regions. The adjacent regions show a relatively constant, low star formation rate over the past 100 Myr. There is no significant difference between the stellar populations on either side of the active regions. This symmetry provides no obvious signature of recent propagation of star formation near these currently active regions of the M31 disk.