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CEN 34-high-mass YSO in M 17 or background post-AGB star?
Chen.Zhiwei, Nurnberger.Dieter E.A., Chini.Rolf, Liu.Yao, Fang.Min, Jiang.Zhibo
2013
Source PublicationAstronomy and Astrophysics
ISSN0004-6361
Volume557Pages:A51
AbstractWe investigate the proposed high-mass young stellar object (YSO) candidate CEN 34, thought to be associated with the star-forming region M 17. Its optical to near-infrared (550-2500 nm) spectrum reveals several photospheric absorption features, such as H, the Ca ii triplet, and the CO bandhead, but lacks emission lines. The spectral features in the range 8375-8770 A are used to constrain an effective temperature Teff = 5250 250 K (early-/mid-G) and a log g = 2.0 0.3 (supergiant). The spectral energy distribution (SED) displays a faint infrared excess that resembles that of a high-mass YSO or an evolved star of intermediate mass. Moreover, the observed temperature and surface gravity are identical for high-mass YSOs and evolved stars. The radial velocity of CEN 34 relative to the local standard of rest (VLSR) as obtained from various photospheric lines is of the order of-60 km s-1 and thus distinct from the +25 km s-1 found for several OB stars in the cluster and for the associated molecular cloud. The SED modeling yields 10-4 MS of circumstellar material, which contributes only a tiny fraction to the total visual extinction (11 mag). The distance of CEN 34 is between 2.0 kpc and 4.5 kpc. In the case of a YSO, a dynamical ejection process is proposed to explain the VLSR difference between CEN 34 and M 17. Additionally, to match the temperature and luminosity, we speculate that CEN 34 had accumulated the bulk of its mass with an accretion rate 4 10-3MS/yr over a very short time span (103 yrs), and it is currently undergoing a phase of gravitational contraction without any further mass gain. However, all the aforementioned characteristics of CEN 34 are compatible with an evolved star of 5-7 MS and an age of 50-100 Myr, so it is most likely a background post-AGB star with a distance between 2.0 kpc and 4.5 kpc. We consider the latter classification as the more likely interpretation. Further discrimination of the two possible scenarios should come from the stricter confinement of CEN 34's distance. 2013 ESO.
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9842
Collection分子云与恒星形成研究团组
Recommended Citation
GB/T 7714
Chen.Zhiwei, Nurnberger.Dieter E.A., Chini.Rolf, Liu.Yao, Fang.Min, Jiang.Zhibo. CEN 34-high-mass YSO in M 17 or background post-AGB star?[J]. Astronomy and Astrophysics,2013,557:A51.
APA Chen.Zhiwei, Nurnberger.Dieter E.A., Chini.Rolf, Liu.Yao, Fang.Min, Jiang.Zhibo.(2013).CEN 34-high-mass YSO in M 17 or background post-AGB star?.Astronomy and Astrophysics,557,A51.
MLA Chen.Zhiwei, Nurnberger.Dieter E.A., Chini.Rolf, Liu.Yao, Fang.Min, Jiang.Zhibo."CEN 34-high-mass YSO in M 17 or background post-AGB star?".Astronomy and Astrophysics 557(2013):A51.
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