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$\begin{figure} \par\includegraphics[width=6.5cm,clip]{0900fig1.eps} \end{figure}$ Figure 1: Schematic diagram showing the interaction of an HH jet/counterjet system with an isotropic stellar wind. The position of the jet source is shown with a circle. The stellar wind source is located at the origin of the coordinate system(s). Top frame: the locus of the jet and counterjet is shown with the thick, solid curve. This curve reaches the point of closest approach to the stellar wind source (i.e., the ``stagnation point'' of the curve) on the x-axis of the xy-coordinate system. The locus of the jet/counterjet is given by $R(\theta )$ , where R is the spherical radius and $\theta$ the angle with respect to the x-axis. $R(\theta )$ goes to infinity at $\theta =\pm \theta _{\rm m}$ . The total deflection of the jet/counterjet path is $\Psi =\pi -2\theta _{\rm m}$ . $\beta$ is the angle between the radial direction and the normal unit vector ${\hat n}$ to the jet/counterjet path. Bottom frame: two frames of reference (both with the origin on the stellar wind source and with the xy-plane on the plane of the jet/counterjet locus) are used in the analytic model. The xy-frame has the abscissa on the line joining the stellar wind source and the stagnation point (which is at a distance $R_{\rm s}$ from the wind source), and the x'y'-frame has the abscissa on the line joining the wind source and the jet source (which is at a distance D from the wind source). The jet/counterjet system is ejected at an angle $\alpha$ , measured counterclockwise from the x' axis. The angle subtended by the jet source, the wind source and the stagnation point is $\theta _{\rm s}$ (the figure shows a configuration with positive $\theta _{\rm s}$ ).
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In the text

$\begin{figure} \par\includegraphics[width=6cm,clip]{0900fig2.eps} \end{figure}$ Figure 2: Curves for the jet/counterjet locus for different values of the dimensionless parameter $\epsilon$ (see the text). The curves correspond to $\epsilon =0.25$ (most highly curved solution), 0.5, 1.0, 2.0, 4.0, 8.0, 16.0 and 1000 (almost straight solution). The positions are given in units of the distance $R_{\rm s}$ between the wind source and the stagnation point (see Fig. 1). The xy-coordinate system is used (see Fig. 1), so that the wind source is at the origin, and the stagnation point at (x,y)=(1,0).
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In the text

$\begin{figure} \par\includegraphics[width=6cm,clip]{0900fig3.eps} \end{figure}$ Figure 3: The jet/counterjet locus for $\epsilon =1$ ( top frame) and for $\epsilon =10$ ( bottom frame). The curves correspond to ejection angles $\alpha =90$ (curve with reflection symmetry on the x'-axis), 75, 60, 45, 30, 15 and $1^\circ$ (see the text). The positions are given in units of the distance D between the wind source and the jet source (see Fig. 1). The x'y'-coordinate system is used (see Fig. 1), so that the wind source is at the origin, and the jet source at (x',y')=(1,0).
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In the text