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arXiv 1409.7906astro-ph.GAastro-ph.SR
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星团中候选红超巨星的近红外光谱

Near-infrared spectroscopy of candidate red supergiant stars in clusters

Maria Messineo, Zhu Qingfeng, Valentin D. Ivanov, Donald F. Figer, Ben Davies, Karl M. Menten, Rolf P. Kudritzki, C. -H. Rosie Chen

摘要:

尽管有大量的候选星团,但距离太阳几千秒差距以上的银河系年轻星团的清晰识别是罕见的。我们的目标是提高候选集群的选择丰富的大质量恒星的光度银河系数据,从光学到中红外波长的多波长分析。我们对5个候选星团进行了光度和光谱分析,这些星团在GLIMPSE和2 MASS图像中被选为高密度的亮星(Ks < 7等)。共获得48个红外光谱。测光和光谱学的结合产生了6颗新的红超巨星,质量从10 Msun到15 Msun。其中两颗红超巨星位于银河系坐标(l,b)=(16.7deg,-0.63deg),距离约3.9 kpc;另外四颗红超巨星是星系团的成员,位于银河系坐标(l,b)=(49.3deg,+0.72deg),距离约7.0 kpc。对探测到的高密度最亮恒星的光谱分析和沿其视线的星际消光研究是区分低消光区域和实际星团的基础。对包含红超巨星的年轻星团的普查是不完整的;在现有的全天近红外巡天中,它们可以被识别为明亮恒星的超密度,其红外色星等图的特征是空白。

英文摘要:

Clear identifications of Galactic young stellar clusters farther than a few kpc from the Sun are rare, despite the large number of candidate clusters. We aim to improve the selection of candidate clusters rich in massive stars with a multiwavelength analysis of photometric Galactic data that range from optical to mid-infrared wavelengths. We present a photometric and spectroscopic analysis of five candidate stellar clusters, which were selected as overdensities with bright stars (Ks < 7 mag) in GLIMPSE and 2MASS images. A total of 48 infrared spectra were obtained. The combination of photometry and spectroscopy yielded six new red supergiant stars with masses from 10 Msun to 15 Msun. Two red supergiants are located at Galactic coordinates (l,b)=(16.7deg,-0.63deg) and at a distance of about ~3.9 kpc; four other red supergiants are members of a cluster at Galactic coordinates (l,b)=(49.3deg,+0.72deg) and at a distance of ~7.0 kpc. Spectroscopic analysis of the brightest stars of detected overdensities and studies of interstellar extinction along their line of sights are fundamental to distinguish regions of low extinction from actual stellar clusters. The census of young star clusters containing red supergiants is incomplete; in the existing all-sky near-infrared surveys, they can be identified as overdensities of bright stars with infrared color-magnitude diagrams characterized by gaps.

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