Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1701o&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #17.01; Bulletin of the American Astronomical Society, Vol. 24, p.1147
Other
Scientific paper
We have reduced and analyzed a set of narrow-band HST images of a portion of M42 south of the Trapezium. Many new emission line sources were found, some quite long but so narrow that they are not seen on groundbased images. These include thin shells which are high ionization shocks and are moving supersonically. The structure around Orion HH3 is resolved into multiple components. Slit spectroscopy data establishes the high expansion velocities of these regions. The other objects seen are protoplanetary disks (PPDs). Although some had been detected in VLA surveys and one had been seen from the ground optically, the new images show previously undetected structure and clearly establish the nature of the objects. They are neutral disks surrounding low mass pre-main sequence stars and are ionized from the outside by either theta (1) C or theta (2) A Ori.
Hester Jeff J.
Hu Xihai
O'Dell Charles Robert
Wen Zheng
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