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Title: Kinematics of the cometary globules in the Gum Nebula
Authors: Sridharan, T.K.
Keywords: Cometary globules;
Gum Nebula;
star formation;
Issue Date: 1992
Publisher: Indian Academy of Sciences, Bangalore, India.
Citation: Journal of Astrophysics and Astronomy, 1992, Vol. 13, p217-239.
Abstract: We report a study of the kinematics of the cometary globules in the Gum Nebula using the J = 1 → 0 transition line of ¹²CO. A morphological center for the system with which 60 % of the globules are associated is identified. It is shown that the observed radial velocities of the heads of the globules are consistent with an expansion of the system. Systematic velocity gradients are present along some of the tails. The estimated expansion age and the tail stretching age are both ~ a few million years, suggesting a common origin for the expansion and the formation of the tails. The presence of young stars of similar ages in some of the globules points to star formation triggered by the same cause. Possible scenarios are briefly discussed.
ISSN: 0250-6335
Copyright: Indian Academy of Sciences, Bangalore, India.
Appears in Collections:Research Papers (A&A)

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