Kinematics of the Cometary Globules in the Gum Nebula

Sridharan, TK (1992) Kinematics of the Cometary Globules in the Gum Nebula. In: Journal of Astrophysics & Astronomy, 13 (3). pp. 217-239.

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Abstract

We report a study of the kinematics of the cometary globules in the Gum Nebula using the J = 1 yields 0 transition line of (CO-12)O. A morphological center for the system with which 60 percent 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 about 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.

Item Type:	Journal Article
Publication:	Journal of Astrophysics & Astronomy
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	Cometary globules;Gum Nebula;star formation
Department/Centre:	Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited:	05 May 2011 06:49
Last Modified:	05 May 2011 06:49
URI:	http://eprints.iisc.ac.in/id/eprint/37178

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