Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7418p&link_type=abstract
HST Proposal ID #7418
Computer Science
Hst Proposal Id #7418 Young Stars And Circumstellar Material
Scientific paper
HST/WFPC2 observations have shown that several young stellar objects in the nearby Taurus molecular clouds are seen only indirectly via scattered light. At optical wavelengths these systems show bipolar reflection nebulae separated by a central dark absorption lane obscuring direct view of the star. Within these bipolar nebulae the scattered light distribution is patchy and irregular, suggesting that the circumstellar envelopes inferred from the sources' infrared spectral energy distributions are responsible for the nebular morphology. We propose NICMOS observations of these systems in order to penetrate the overlying envelopes to obtain direct views of the young circumstellar disks believed to be associated with these sources. The new NICMOS images will be compared with the existing WFPC2 images and with model reflection nebulae to constrain the circumstellar density distributions. The dark absorption lanes already seen in these systems suggest that the NICMOS images will reveal edge-on disks similar to the HST results for HH 30, and thus allow direct observation of the disk geometry. Only HST can provide the linear resolution and dynamic range needed to reveal these disks at spatial scales relevant to the origin of the solar system.
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