Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9091h&link_type=abstract
HST Proposal ID #9091
Physics
Hst Proposal Id #9091 Star Formation
Scientific paper
There are significant difficulties with the current understanding of the YSO disks and evaporative envelopes in the Orion nebula and how these objects fit into the broader picture of star formation. These are generally imagined to be a long-lived population, yet searches have turned up few such objects anywhere but Orion. Further, the observed masses of the disks in Orion combined with their observed evaporative mass loss rates imply ages for the objects of only a few * 10^4 years. Henney and O'Dell {1999} claim that no solution is possible unless submillimeter determinations of disk masses are off by a factor of 30. We suggest instead that these objects are only 10^4 years old, and that we are catching them as they are being uncovered by the advancing ionization front located only about 2 * 10^17 cm behind the Trapezium. When a YSO is uncovered by an advancing ionization front it will pass through two short-lived stages, first as an evaporating gaseous globule {EGG} such as those seen in M 16, then as an evaporating disk such as those seen in Orion. Such objects will live for only a few * 10^4 years, and should be found only in close proximity to molecular cloud walls. We propose to test this idea by looking for EGGs and silhouette disks in two young clusters and along one molecular cloud wall.
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