
%0 Journal Article
%A Sugitani, Koji 
%A Ogura, Katsuo 
%T Remnant Molecular Clouds in the Ori OB 1 Association
%J Publications of the Astronomical Society of Australia
%D 1998/04/01
%V 15
%N 1
%P 91-98
%K 
%R https://doi.org/10.1071/AS98091
%U https://www.publish.csiro.au/paper/AS98091 
%X 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 re°ection 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. 
