红外尘泡N109中的恒星形成  

Star Formation in the Infrared Bubble N109

作　　者：孙金旭 李金增[1] 刘洪礼 董晓怡 袁敬华 张国印 SUN Jin-xu;LI Jin-zeng;LIU Hong-li;DONG Xiao-yi;YUAN Jing-hua;ZHANG Guo-yin(China-Argentina Observation Base,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Astronomy,Yunnan University,Kunming 650091,China;Departamento de Astronomía,Universidad de Concepción,Av.Esteban Iturra s/n,Distrito Universitario,160-C,Chile)

机构地区：[1]中国科学院国家天文台中阿观测基地,北京100012 [2]中国科学院大学,北京100049 [3]云南大学天文系,昆明650091 [4]Departamento de Astronomía,Universidad de Concepción,Av.Esteban Iturra s/n,Distrito Universitario,160-C,Chile

出　　处：《天文学进展》2021年第2期249-264,共16页Progress In Astronomy

基　　金：科技部国际合作“走出去”重大专项(2010DFA02710);国家自然科学基金(11503035,11573036)。

摘　　要：与电离氢区成协的红外尘泡是研究恒星形成尤其是触发恒星形成的理想天体实验室。利用多波段数据对银河系中最大的尘泡之一N109进行了研究,分析了它对其近邻介质及其中恒星形成活动的影响。研究发现N109周围存在56个致密团块,主要分布在正北部和西部。它们均可能形成恒星,其中5个很可能形成大质量恒星,而其他的均可能形成小质量恒星。在这两个区域还存在5个袖珍电离氢区,意味着新一代的大质量恒星形成。此外,还观测到与N109成协的电离氢区的膨胀正在挤压正北和西部星际介质的迹象。这些结果共同表明红外尘泡N109正在通过电离氢区膨胀作用于周围介质,并通过挤压的方式再聚集物质,为新一代恒星形成提供了场所,这可能为触发恒星形成提供了一个必要的条件。Infrared(IR)bubbles associated with HII regions are ideal targets for studying triggered star formation.We present a multi-wavelength(from IR to centimetre wavelengths),comprehensive analysis on the impact of the IR bubble N109,one of the largest bubbles in our Galaxy,on its surroundings and star formation therein.Fifty-six dense clumps are found associated with the bubble and mainly located in the north and west.They all most likely form new stars eventually,five of which most likely form high-mass stars and others of which form low-mass stars.In these two regions there are also five associated compact HII regions,indicative of a new generation of high-mass star formation.In addition,a signature of the compression acting on the surroundings by the expansion of the bubble/HII region is observed in the north and west of N109.These results collectively indicate that N109 is impacting its surroundings due to the expansion of the associated driving HII region.This expansion compresses the surroundings,collecting material to provide physical environments for next generation of star formation,which provides a necessary condition for triggered star formation.We therefore suggest that N109 would be a potential site of triggered star formation.

关 键 词：大质量恒星形成 星际介质 电离氢区 分子云 红外尘泡 

分 类 号：P155.2[天文地球—天文学]