论文标题
JWST时代LMC中M-Star的表征
Characterization of M-stars in the LMC in the JWST era
论文作者
论文摘要
我们通过以祖细胞的主要特性和偶发性包膜中存在的尘埃来表征各个来源，研究大麦芽云（LMC）的M型渐近巨型分支（AGB）种群。为此，我们比较了Spitzer收集的光谱和光度数据的组合，并补充了文献中可用的其他光度法结果，以及来自AGB建模的结果，其中包括对风中灰尘形成的描述。为了允许对可能通过后AGB阶段演变的稀疏恒星的解释，我们扩展了可用的进化序列以达到PN相。本分析的主要动机是通过识别出最大程度地表征观察到的来源的滤镜组合，以准备由詹姆斯·韦伯太空望远镜（JWST）进行的当地群体星系的未来观察结果。目前的结果表明，对于M-Star案例，用于此目的的最佳平面是颜色 - 标志性（[F770W] - [F2550W]，[F770W]）和（KS- [F770W]，[F770W]）平面。在这些观察图中，在C-Star阶段和经历热底部燃烧的大量AGB之前，低质量恒星在AGB阶段演变的序列清楚地分离并具有特殊的来源
We study the M-type asymptotic giant branch (AGB) population of the Large Magellanic Cloud (LMC) by characterizing the individual sources in terms of the main properties of the progenitors and of the dust present in the circumstellar envelope. To this aim, we compare the combination of the spectroscopic and photometric data collected by Spitzer, complemented by additional photometric results available in the literature, with results from AGB modelling that include the description of dust formation in the wind. To allow the interpretation of a paucity stars likely evolving through the post-AGB phase, we extended the available evolutionary sequences to reach the PN phase. The main motivation of the present analysis is to prepare the future observations of the evolved stellar populations of Local Group galaxies that will be done by the James Webb Space Telescope (JWST), by identifying the combination of filters that will maximize the possibilities of characterizing the observed sources. The present results show that for the M-star case the best planes to be used for this purpose are the colour-magnitude ([F770W]-[F2550W], [F770W]) and (Ks-[F770W], [F770W]) planes. In these observational diagrams the sequences of low-mass stars evolving in the AGB phases before the achievement of the C-star stage and of massive AGBs experiencing hot bottom burning are clearly separated and peculiar sources, such as post-AGB, dual-dust chemistry and iron-dust stars can be easily identified
