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题名: H alpha emission objects in Circinus
作者: Noroozi, S.1; Haas, M.1; Chen, Z.1, 2; Chini, R.1, 3
刊名: ASTRONOMISCHE NACHRICHTEN
出版日期: 2013-03-01
卷号: 334, 期号:3, 页码:282-287
关键词: dust, extinction ; ISM: clouds ; stars: pre-main sequence
DOI: 10.1002/asna.201211843
文章类型: Article
英文摘要: We present a new survey for H alpha emission objects in the Circinus cloud complex and introduce an efficient photometric method for detecting H alpha emission via observations in a narrow-band filter. The observed flux is compared to a blackbody fit of the continuum. Our search strategy reveals 20 stars with strong H alpha emission (EW > 10 angstrom), eight of them being new detections. All H alpha stars display infrared excess corroborating their youth. On the other hand, the region contains a number of infrared excess objects that do not show H alpha emission. Our results support the picture that accretion - as witnessed by H alpha emission - is a highly variable phenomenon. Therefore, H alpha surveys can only trace the temporarily active objects. In contrast, infrared excess is a more robust tracer that reveals most of the population of young stellar objects in a star forming region. Our analysis of the general stellar content of the region yields a reliable distance of 450 pc for the Circinus cloud. Moreover, we find a ratio of total-to-selective extinction of R-V = 2.8 suggesting that smaller-than-normal dust grains may be present. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STARS ; CLOUD
收录类别: SCI
语种: 英语
WOS记录号: WOS:000325860700009
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15526
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Ruhr Univ Bochum, Astron Inst, D-44801 Bochum, Germany
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Catolica Norte, Inst Astron, Santiago, Chile
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