Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...515l..35k&link_type=abstract
The Astrophysical Journal, Volume 515, Issue 1, pp. L35-L38.
Astronomy and Astrophysics
Astronomy
30
Stars: Binaries: Close, Stars: Circumstellar Matter, Ism: Jets And Outflows, Stars: Individual: Constellation Name: Xz Tauri, Stars: Pre-Main-Sequence
Scientific paper
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.
Ballester Gilda E.
Burrows Christopher J.
Clarke John T.
Crisp David
Evans Robin W.
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