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Title:
Hubble Space Telescope WFPC2 Imaging of XZ Tauri:Time Evolution of a Herbig-Haro Bow Shock
Authors:
Krist, John E.; Stapelfeldt, Karl R.; Burrows, Christopher J.; Hester, J. Jeff; Watson, Alan M.; Ballester, Gilda E.; Clarke, John T.; Crisp, David; Evans, Robin W.; Gallagher, John S., III; Griffiths, Richard E.; Hoessel, John G.; Holtzman, Jon A.; Mould, Jeremy R.; Scowen, Paul A.; Trauger, John T.
Publication:
The Astrophysical Journal, Volume 515, Issue 1, pp. L35-L38. (ApJ Homepage)
Publication Date:
04/1999
Origin:
APJ
ApJ Keywords:
STARS: BINARIES: CLOSE, STARS: CIRCUMSTELLAR MATTER, ISM: JETS AND OUTFLOWS, STARS: INDIVIDUAL: CONSTELLATION NAME: XZ TAURI, STARS: PRE-MAIN-SEQUENCE
DOI:
10.1086/311961
Bibliographic Code:
1999ApJ...515L..35K

Abstract

We report observations of dramatic morphological changes in the extremely young Herbig-Haro object ejected by the pre-main-sequence binary XZ Tauri. Hubble Space Telescope images taken in 1995 showed a filled bubble of emission nebulosity extending 4" north-northeast of the system in the direction of a previously known jet. New images obtained in 1998 show that the bubble has undergone a remarkable transition into a limb-brightened structure as it continues its motion away from the binary. The new images suggest that we may be witnessing the initial formation of the postshock cooling zone in a newly emerging Herbig-Haro bow shock system, probably accompanied by significant temporal evolution in the nebula's emission line spectrum.
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