干旱区生态环境知识资源中心

We present spectre-imaging observations recently obtained with the TIGER and OASIS instruments at the CFHT, aimed at constraining the ejection and collimation mechanisms in active young premain sequence stars (age similar or equal to 1-3 Myrs). Three stars have been observed so far in the lines of [O I] 6300 Angstrom, H alpha, [N II] 6584 Angstrom and [S II] 6717,6731 Angstrom Angstrom with spatial resolutions ranging from 0.5 " to 0.25 " and velocity resolutions of 170 and 100 km s(-1). The morphology of the inner regions of the wind is revealed with unprecedented details. Constraints on excitation conditions and collimation and acceleration processes are derived.