\documentstyle[psfig,paasms4,pptwocol]{preprint}
%\slugcomment{To appear in the Astrophysical Journal}
%\lefthead{Krist J. {\it et al.}}
%\righthead{HST WFPC2 Images of Emission Nebulosity Near XZ Tauri}
\input pub.sty
\hoffset=-.1in
\begin{document}
\title{HST WFPC2 IMAGES OF EMISSION NEBULOSITY NEAR XZ TAURI}
\author{John E.\ Krist,\thanks{Space Telescope Science Institute, 
3700 San Martin Drive, Baltimore, MD 21218}
Christopher J.\ Burrows,\samethanks{1}\morethanks{Astrophysics Division, 
Space Science Department, European Space Agency}
Karl R.\ Stapelfeldt,\thanks{MS 183-900, Jet Propulsion Laboratory, 
4800 Oak Grove Drive, Pasadena CA 91109}
Gilda E.\ Ballester,\thanks{Dept.\ of Atmospheric, Oceanic, and Space Sciences, 
University of Michigan, 2455 Hayward, Ann Arbor MI 48109}\\
\and
John T.\ Clarke,\samethanks{4}
David Crisp,\samethanks{3}
Robin W.\ Evans,\samethanks{3}
John S.\ Gallagher III,\thanks{Dept. of Astronomy, University of Wisconsin, 
475 N. Charter St., Madison WI 53706}
Richard E.\\
\and
Griffiths,\thanks{Dept.\ of Physics, Carnegie-Mellon University, 
Wean Hall, 5000 Forbes Ave., Pittsburgh PA 15213}
J.\ Jeff Hester,\thanks{Dept.\ of Physics and Astronomy, Arizona State 
University, Tyler Mall, Tempe AZ 85287}
Jon A.\ Holtzman,\thanks{Dept.\ of Astronomy, New Mexico State University, 
Box 30001, Dept.\ 4500, Las Cruces NM 88003-8001}
John G.\ Hoessel,\samethanks{5}
Jeremy R.\ Mould,\thanks{Mt.\ Stromlo and Siding Springs Observatories, 
Australian National University, Weston Creek Post Office, ACT 2611 Australia}\\
\and
Paul A.\ Scowen,\samethanks{7}
John T.\ Trauger,\samethanks{3}
Alan M.\ Watson,\samethanks{8}
and James A.\ Westphal\/\thanks{Divn.\ of Geological and Planetary Sciences, MS 
170-25 Caltech, Pasadena CA 91125}}

\pub{The Astrophysical Journal}
\recacc{2 October 1996}{9 December 1996}
\maketitle

\abstract{
XZ~Tauri is a M3V T~Tauri star with a pre-main sequence binary companion
detected by infrared speckle interferometry at a projected separation of
0\farcs 3 (about 40~AU).  Previous ground based observations of the system have
shown bipolar emission nebulosity, including a possible jet knot.  Images
obtained with the Wide Field and Planetary Camera~2 on the Hubble Space
Telescope show an elongated, filled bubble of emission nebulosity extending
over 4\arcsec\ to the north of the system which contains two or three compact
knots.  The source of the nebulosity is undetermined.  For the first time, the
components are separated in visible light, and the southern component 
(XZ~Tau~S) dominates the integrated light of the system.  The reverse has been 
found to be true in the near-infrared.  Thus we confirm that XZ~Tauri belongs 
to the small class of young binaries with cool infrared companions. }