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Remnant Molecular Clouds in the Ori OB 1 Association

Published online by Cambridge University Press:  16 May 2016

Katsuo Ogura  and
Koji Sugitani
Katsuo Ogura
Affiliation:
Kokugakuin University, Higashi, Shibuya-ku, Tokyo 150-8440, Japan; ogura@kokugakuin.ac.jp
Koji Sugitani
Affiliation:
Institute for Natural Sciences, Nagoya-City University, Mizuho-ku, Nagoya 467-8501, Japan
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Abstract

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We suggest and give some evidence that as an HII region expands and the O stars evolve into B giants, remains of the molecular clouds first appear as bright-rimmed clouds, then as cometary globules and finally as small clouds which are visible by the reflected light from the B giants. We propose to call the last of these ‘reflection clouds’ and all three categories collectively ‘remnant clouds’. A list is presented of about 80 objects of these remnant clouds in the Ori OB 1 association. In the Belt region there is a beautiful spatial sequence from bright-rimmed clouds through cometary globules to reflection clouds. We suspect that retarded star formation in remnant clouds can explain the presence of so-called dispersed T Tau stars in the peripheries of OB associations.

Keywords

ISM: molecular cloudsISM: globulesHII regionsOB associationsstars: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 91 - 98
Copyright
Copyright © Astronomical Society of Australia 1998

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