arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.1130astro-ph.SR
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AKARI对邻近恒星的红外观测:使用AKARI红外相机全天巡天、2 MASS和依巴谷星表

AKARI's infrared view on nearby stars : Using AKARI Infrared Camera All-Sky Survey, 2MASS, and Hipparcos catalog

Y. Ita, M. Matsuura, D. Ishihara, S. Oyabu, S. Takita, H. Kataza, I. Yamamura, N. Matsunaga, T. Tanabe, Y. Nakada, H. Fujiwara, T. Wada, T. Onaka, H. Matsuhara

摘要:

结果:(B-V)v.s.(V-S9 W)色-色图对于识别星周包层/盘中红外过剩的恒星是有用的。在这张图中,红外线过剩的Be星与其他类型的星很好地分开了。而(J-L18W)v.s.(S9 W-L18 W)图是一种有效的分类工具。富碳的渐近巨星分支(AGB)星和OH/IR星在这张色图中形成了不同的序列。年轻恒星天体、主序前星、AGB后星和行星状星云具有最大的中红外色余,可以在红外星表中识别。最后,我们绘制L18 W与(S9 W-L18 W)色星等图,使用AKARI数据和依巴谷彗星。这张图可以用来识别低质量的YSO,以及AGB星。我们发现这张图与使用斯皮策太空望远镜数据的大麦云源的[24] vs([8.0]-[24])图相当。我们对银河系天体的理解将用于解释斯皮策空间望远镜观测到的邻近星系中恒星星族的色星等图。--结论--我们对AKARI色-色和色-星等的研究将在未来用于探索未知天体的性质。此外,我们的分析强调了未来的关键项目,以了解恒星演化与拱星包络,一旦即将到来的天文数据与GAIA可用。

英文摘要:

--Results-- We found that the (B-V) v.s. (V-S9W) color-color diagram is useful to identify the stars with infrared excess emerged from circumstellar envelopes/disks. Be stars with infrared excess are well separated from other types of stars in this diagram. Whereas (J-L18W) v.s. (S9W-L18W) diagram is a powerful tool to classify several object-types. Carbon-rich asymptotic giant branch (AGB) stars and OH/IR stars form distinct sequences in this color-color diagram. Young stellar objects (YSOs), pre-main sequence (PMS) stars, post-AGB stars and planetary nebulae (PNe) have largest mid-infrared color-excess, and can be identified in infrared catalog. Finally, we plot L18W v.s. (S9W-L18W) color-magnitude diagram, using the AKARI data together with Hipparcos parallaxes. This diagram can be used to identify low-mass YSOs, as well as AGB stars. We found that this diagram is comparable to the [24] vs ([8.0]-[24]) diagram of Large Magellanic Cloud sources using the Spitzer Space Telescope data. Our understanding of Galactic objects will be used to interpret color-magnitude diagram of stellar populations in nearby galaxies which Spitzer Space Telescope has observed. --Conclusions-- Our study of the AKARI color-color and color-magnitude will be used to explore properties of unknown objects in future. In addition, our analysis highlights a future key project to understand stellar evolution with circumstellar envelope, once the forthcoming astronometrical data with GAIA are available.

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