Remnant molecular clouds in the ORI OB 1 association

Details Remnant molecular clouds in the ORI OB 1 association Remnant molecular clouds in the ORI OB 1 association

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15...91o&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 1, p. 91-98

Astronomy and Astrophysics

Astronomy

33

Interstellar Medium, Molecular Clouds, Globules, Hii Regions, Ob Associations

Scientific paper

We suggest and give some evidence that as an HII region expands and the O star(s) evolve(s) into B giant(s) the 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 one `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.

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