Kinematics of the cometary globules in the GUM Nebula

Details Kinematics of the cometary globules in the GUM Nebula Kinematics of the cometary globules in the GUM Nebula

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992japa...13..217s&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 13, no. 3, p. 217-239.

Astronomy and Astrophysics

Astrophysics

23

Cometary Atmospheres, Gum Nebula, Radial Velocity, Star Formation, Carbon Monoxide, Globules, Radiation Pressure, Stellar Winds, Supernovae

Scientific paper

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.

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