Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8238h&link_type=abstract
HST Proposal ID #8238
Other
Hst Proposal Id #8238 Young Stars And Circumstellar Material
Scientific paper
We propose a program of slitless spectroscopy with STIS to image both the low velocity component {LVC} and high velocity component {HVC} of forbidden line emission in single and binary low mass stars undergoing disk accretion. Recent observations suggest that forbidden emission lines trace two distinct outflows from classical T Tauri stars, both associated with disk accretion, but with distinctive kinematic signatures and physical properties. The HVC arises in a stellar jet, with a mass loss rate proportional to the disk accretion rate, while the LVC has a much lower velocity than the jet and becomes the dominant source of forbidden line emission in sources with modest disk accretion rates. The spatial distribution of the LVC will be traced by images of O ILambda5577, which emits only in the LVC. Several arguments suggest that the LVC arises in a slow wind that emerges from the disk at radii out to tens of AU. The proposed observations will provide a decisive test of this hypothesis. Images of other lines such as N II Lambda6583 that emit only HVC gas will define the morphology of the jet as it emerges from the star. These images will quantify how close to the star the jets become collimated. Our targets, which include one single star and four binaries of separation ranging from 0.03 AU - 465 AU, will allow us to determine how binarity affects disk winds and jet collimation.
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