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Molecular gas and triggered star formation surrounding Wolf-Rayet stars

Published online by Cambridge University Press:  21 March 2013

Tie Liu
Affiliation:
Department of Astronomy, Peking University, Postbus 100871, Beijing, China email: [email protected]
Yuefang Wu
Affiliation:
Department of Astronomy, Peking University, Postbus 100871, Beijing, China email: [email protected]
Huawei Zhang
Affiliation:
Department of Astronomy, Peking University, Postbus 100871, Beijing, China email: [email protected]
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Abstract

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The environments surrounding nine Wolf-Rayet stars were studied in molecular emission. Expanding shells were detected surrounding these WR stars (see left panels of Figure 1). The average masses and radii of the molecular cores surrounding these WR stars anti-correlate with the WR stellar wind velocities (middle panels of Figure 1), indicating the WR stars has great impact on their environments. The number density of Young Stellar Objects (YSOs) is enhanced in the molecular shells at ∼5 arcmin from the central WR star (lower-right panel of Figure 1). Through detailed studies of the molecular shells and YSOs, we find strong evidences of triggered star formation in the fragmented molecular shells (Liu et al. 2010).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013

References

Liu, Tie., Wu, , Yuefang, , Zhang, , Huawei, , Qin, , & Sheng-Li, 2012 ApJ, 751, 68CrossRefGoogle Scholar