英国红外望远镜(UKIRT)M33监测项目:千秒差距中心区15年近红外变星星表,以及恒星形成历史与尘埃回流的前景
The UKIRT M33 Monitoring Project: A 15-Year Near-Infrared Variable Star Catalogue for the Central Kiloparsec, and Prospects for Star Formation History and Dust Return
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中文总结 AI 辅助
该研究基于UKIRT M33监测项目构建M33中心区15年K波段变星星表,确认91%为变星及120个尘埃包裹AGB候选体,后续将用该星表研究恒星形成历史与尘埃气体质量损失率。
中文摘要 AI 辅助
我们公布英国红外望远镜(UKIRT)M33监测项目的成果,该项目是对本星系群旋涡星系M33中变光红巨星的近红外巡天项目。结合四个独立测光数据集,涵盖UIST(2003年)、UFTI(2005年)、WFCAM(2005-2007年)以及新的UKIRT半球巡天时代(2018年),我们构建了千秒差距中心区847颗恒星的均匀化15.11年K波段光变曲线星表,其中771颗(占91%)为变星。与存档的斯皮策(Spitzer)测光交叉匹配,确认了120个被尘埃包裹的渐近巨星支(AGB)候选体。我们将该中心星表的空间覆盖范围与早期仅基于UIST的(论文I)和覆盖整个星系盘的WFCAM(论文IV)变星巡天进行了比较。基于该星表,两篇即将发表的论文将:(i)测量单个脉动周期以重建千秒差距中心区的恒星形成历史;(ii)利用延长的时间基线精确测定整个星系盘的尘埃与气体质量损失率。
英文摘要
We present results from the UKIRT M33 Monitoring Project, a near-infrared survey of variable red giants in the Local Group spiral galaxy M33. Combining four independent photometric datasets spanning UIST (2003), UFTI (2005), WFCAM (2005-2007), and a new UKIRT Hemisphere Survey epoch (2018), we construct a homogenised 15.11-year $K$-band light-curve catalogue for 847 stars in the central kiloparsec, of which 771 (91 per cent) are variable. Cross-matching with archival Spitzer photometry identifies 120 dust-enshrouded AGB candidates. We compare the spatial coverage of this central catalogue with the earlier UIST-only (Paper I) and disc-wide WFCAM (Paper IV) variable-star surveys. Building on this catalogue, two forthcoming papers will (i) measure individual pulsation periods to reconstruct the star formation history of the central kiloparsec, and (ii) refine dust and gas mass-loss rates across the disc using the extended time baseline.