Kinematics of the Young Stellar Objects associated with the Cometary Globules in the Gum Nebula

Abstract

An analysis of proper motion measurements of the Young Stellar Objects (YSOs) associated with the Cometary Globules (CGs) in the Gum Nebula is presented. While earlier studies based on the radial velocity measurements of the CGs suggested expansion of the system of the CGs, the observed proper motion of the YSOs shows no evidence for expansion. In particular the kinematics of two YSOs embedded in CGs is inconsistent with the supernova explosion of the companion of $\zeta$ Pup about 1.5 Myr ago as the cause of the expansion of the CG system. YSOs associated with the CGs share the average proper motion of the member stars of the Vela OB2 association. A few YSOs that have relatively large proper motions are found to show relatively low infrared excesses.

19 pages, 6 figures, 4 tables, Accepted for publication in MNRAS

References in corpus (7)

• A Hipparcos census of the nearby OB associations
• Color Transformations for the 2MASS Second Incremental Data Release
• Evolution of emission line activity in intermediate mass young stars
• Triggered star formation in Bright-Rimmed Clouds: The Eagle Nebula revisited
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Cited by in corpus (4)

• A radio-polarisation and rotation measure study of the Gum Nebula and its environment
• A ring in a shell: the large-scale 6D structure of the Vela OB2 complex
• Young Stars near Cometary Globule CG 30 in the Tumultuous Gum Nebula
• An extended scattered light disk around AT Pyx -- Possible planet formation in a cometary globule