论文标题
M31北磁盘中的Astrosat/紫外线簇光度法
AstroSat/UVIT Cluster Photometry in the Northern Disk of M31
论文作者
论文摘要
仙女座银河系（M31）是在Astrosat上使用紫外成像望远镜（UVIT）进行研究的对象。 紫外线和NUV光度法在此处进行，用于与HST/PHAT调查重叠的NE磁盘和凸起的239个簇。将Padova恒星模型应用于170个集群的衍生年龄，质量，金属性和灭绝。年龄在$ \ sim $ 4 MYR和大约100 Myr的宽峰值上显示出一个狭窄的峰值。 log（z/z $ _ {\ odot} $）值主要在$ -0.3 $和$+0.3 $之间。凸起中的7个簇是低金属性和高质量的。大多数簇位于螺旋臂中，并在上面指出的范围内具有金属性。最年轻的簇大多是高金属性，并且集中在螺旋臂的最明亮部分。紫外线和NUV数据对年轻恒星很敏感，并在年龄$ \ sim4 $ myr时检测到磁盘中的恒星形成中的新金属峰。
The Andromeda Galaxy (M31) is an object of ongoing study with the Ultraviolet Imaging Telescope (UVIT) on AstroSat. UVIT FUV and NUV photometry is carried out here for a set of 239 clusters in the NE disk and bulge of M31 which overlap with the HST/PHAT survey. Padova stellar models were applied to derive ages, masses, metallicities and extinctions for 170 clusters. The ages show a narrow peak at $\sim$4 Myr and a broad peak around 100 Myr. log(Z/Z$_{\odot}$) values are mostly between $-0.3$ and $+0.3$. The 7 clusters in the bulge are low metallicity and high mass. Most clusters are in the spiral arms and have metallicities in the range noted above. The youngest clusters are mostly high metallicity and are concentrated along the brightest parts of the spiral arms. The UVIT FUV and NUV data are sensitive to young stars and detect a new metal rich peak in star formation in the disk at age $\sim4$ Myr.
