• T. K. Sridharan

      Articles written in Journal of Astrophysics and Astronomy

    • Kinematics of the cometary globules in the Gum Nebula

      T. K. Sridharan

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      We report a study of the kinematics of the cometary globules in the Gum Nebula using theJ= 1 → 0 transition line of12 CO. 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 estimatedexpansion age and thetail 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.

    • Observations of the bright-rimmed molecular clouds near the Cepheus OB2 association

      C. Indrani T. K. Sridharan

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      Massive stars have significant influence on the evolution of the interstellar medium. Bright rims, cometary morphology of clouds, as well as their motion are some examples of the influence of massive stars on nearby molecular clouds. The cometary clouds in the Gum-Vela region are very good examples. In an attempt to understand the kinematics of the clouds in such regions we have carried out CO line observations towards bright-rimmed clouds near the OB Association Cep OB2. The radial velocities of the clouds are consistent with an expansion of the system at ≈ 4kms−1 away from the dominant O6.5V star in the association, HD206267. We find the rocket mechanism to be the most likely cause for expansion as found for both the Gum-Vela and the Rosette globules. We conclude that such expanding motions are quite common in regions near massive stars and make a brief comparison of the Cepheus system with the Gum-Vela system.

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      Posted on January 27, 2016

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