New clues to the ejection process in young stars:, Forbidden line imaging of T Tauri micro-jets

Details New clues to the ejection process in young stars:, Forbidden line imaging of T Tauri micro-jets New clues to the ejection process in young stars:, Forbidden line imaging of T Tauri micro-jets

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8215d&link_type=abstract

HST Proposal ID #8215

Computer Science

Hst Proposal Id #8215 Stellar Ejecta

Scientific paper

Bipolar outflows play a fundamental role in star formation. However, the ejection and collimation mechanisms are still not identified. Classical T Tauri stars {CTTS} offer a unique opportunity to progress on this problem, as their optical forbidden line emission allows to trace collimated winds very close to the central star {d <= 100 AU}. Determining the exact flow geometry and the line excitation mechanism is essential to obtain new clues to the mass-loss process in young stars. Our team has recently obtained at CFHT the first sub-arcsecond resolution {FWHM=0.15"} images of micro-jets around 3 T Tauri stars: DG Tau, CW Tau, RW Aur. They reveal unprecedented details about the morphology of these jets, strongly suggesting ejection and velocity variability. However, such ground-based studies are limited to high- accretion sources. We propose here to use the unique HST resolution capabilities to image for the first time the innermost regions of jets associated with 4 CTTs wi t h R band magnitudes > 13. Extending our sample to less extreme stars is crucial if we want to derive meaningful constraints on the mass-loss process in CTTS. Images in the 3 narrow-band filters SII, NII and OI will be obtained. We will thus have access both to the jet excitation conditions and intrinsic morphology, and compare them with theoretical predictions from MHD models.

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