Development and Evolution of YSO Outflows and Jets

Details Development and Evolution of YSO Outflows and Jets Development and Evolution of YSO Outflows and Jets

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8289b&link_type=abstract

HST Proposal ID #8289

Physics

Hst Proposal Id #8289 Young Stars And Circumstellar Material

Scientific paper

XZ Tauri, HL Tauri, and HH 30 are three young stars which can be observed simultaneously in a single WFPC2 pointing. Broad-band HST imaging has revealed that the XZ Tauri binary is the source of an elongated bubble of emission nebulosity nearly 5" long. In new images of these objects obtained in March 1998, we discovered that the XZ Tau bubble had expanded significantly and had become markedly limb-brightened since 1995. This behavior suggests that we are witnessing, for the first time, the earliest stages of development of a Herbig-Haro bowshock, perhaps the initial formation of its post-shock cooling zone. We propose to test this hypothesis with emission line imaging and temporal monitoring of the bubble's size and brightness. Simultaneously with the XZ Tau study, we will observe the jets and reflection nebulosities of HH 30 and HL Tauri. Monitoring of HH 30 is particularly important, as our 1998 imaging also revealed that a very large reflected light asymmetry has developed in this prototype young stellar object accretion disk system.

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