Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6506r&link_type=abstract
HST Proposal ID #6506
Other
Hst Proposal Id #6506 Binaries And Star Formation
Scientific paper
Optical and Near Infrared Imaging of nearby Young Stellar Objects at high spatial resolution is beginning to reveal their circumstellar structures on the scale of the solar system. The Serpens Molecular Cloud contains about fifty embedded sources within two arcminutes of the central Serpens Reflection Nebula. The extinction is generally less than in other star forming regions and several cometary nebulae have been observed with ground based telescopes at a wavelength of 0.95Mu. These two factors make the Serpens Cloud especially well suited for high resolution optical imaging of protostars at the pre-T Tauri stage of their evolution. We have recently performed high resolution near infrared observations of the region and detected infalling envelopes of dust and gas which surround the protostars and a candidate protoplanetary disk in the core of the Serpens Reflection Nebula. We propose to image the Serpens Cloud with WFPC-2 using the HAlpha, R and I filters. The high resolution and dynamic range of HST will allow investigation of the inner structure of the envelopes and wind-evacuated bipolar cavities of a large number of protostars observed at different orientations. The data can then be combined with our near infrared data and used to constrain theoretical models of scattered light images developed at Oxford. We can then attempt to determine the masses of the circumstellar structures and the properties of the dust grains.
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