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H alpha emission objects in Circinus
Noroozi, S.1; Haas, M.1; Chen, Z.1,2; Chini, R.1,3
AbstractWe 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
KeywordDust, Extinction Ism: Clouds Stars: Pre-main Sequence
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325860700009
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Document Type期刊论文
Affiliation1.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
Recommended Citation
GB/T 7714
Noroozi, S.,Haas, M.,Chen, Z.,et al. H alpha emission objects in Circinus[J]. ASTRONOMISCHE NACHRICHTEN,2013,334(3):282-287.
APA Noroozi, S.,Haas, M.,Chen, Z.,&Chini, R..(2013).H alpha emission objects in Circinus.ASTRONOMISCHE NACHRICHTEN,334(3),282-287.
MLA Noroozi, S.,et al."H alpha emission objects in Circinus".ASTRONOMISCHE NACHRICHTEN 334.3(2013):282-287.
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