All Figures

$\begin{figure} \par\resizebox{16.0cm}{7.0cm}{\includegraphics{FIG0.eps}}\end{figure}$ Figure 1: The ¹³CO integrated intensity map of L 1251 in the (-2, -6.5) km s^-1 velocity range obtained by Sato et al. (1994). The center position is ${\rm RA}=22^{\rm h}33^{\rm m}$ ${\rm Dec}=74^\circ 58\hbox {$^\prime $ }$ (1950.0). For the designations of the regions indicated, see the Introduction. The bold-line polygon outlines the area presented in Figs. 2 - 4.
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In the text

$\begin{figure} \par\resizebox{17.0cm}{12.1cm}{\includegraphics{FIG1.eps}}\end{figure}$ Figure 2: HNC (upper panel) and HCN (lower panel) integrated intensity maps of L 1251 in the (-2, -6.5) km s^-1 velocity range (for HCN the velocity range of the main 2-1 component). The center position is the same as in Fig. 1 and the observed positions are indicated by dots. The intensity scale is in $T_{\rm A}^* {\rm d}v$ [K km s^-1] and contours start from 0.9 and increase by 0.45 increments to 4.5 for HNC and from 0.8 with a 0.4 increment to 4.0 K km s^-1 for HCN. The stars denote the FIR point sources classified as T Tau stars, and the triangles those classified as embedded YSOs (from Kun & Prusti 1993).
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In the text

$\begin{figure} \par\resizebox{17.0cm}{6.1cm}{\includegraphics{FIG2.eps}}\end{figure}$ Figure 3: The CS (2-1) integrated intensity map of L 1251. The velocity range of the emission, the center position, the intensity scale and markers are as in Fig. 1. Contours start from 0.65 to 1.3 by 0.13 K km s^-1 and from 1.3 to 2.34 by 0.26 K km s^-1.
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In the text

$\begin{figure} \par\includegraphics{FIG3.eps}\end{figure}$ Figure 4: The HCO⁺ (1-0) integrated intensity emission map of L 1251 for the (-2, -8) km s^-1 velocity range. The center position, the intensity scale and markers are as in Fig. 1. Contours start from 0.8 and increase by 0.45 K km s^-1.
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In the text

$\begin{figure} \par\resizebox{5cm}{17.5cm}{\includegraphics{FIG4.eps}}\end{figure}$ Figure 5: The HNC channel velocity maps of the "head'' region. The observed positions are indicated by dots. The intensity scale is in $T_{\rm A}^* {\rm d}v$ [K km s^-1] and the contours start from 0.15 and are increasing by 0.3 K km s^-1. The velocity ranges are given in the lower right corners. Embedded YSOs are marked with triangles and the YSO suspected to be driving the compact outflow is marked by a rectangle. Additionally, our core designations are given in the second and fourth panel.
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In the text

$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{FIG5.eps}}\end{figure}$ Figure 6: Integrated intensity map of the blue - (greyscale) and the red-shifted (contours) HCO⁺ emission of the N1a core. The velocity ranges are (-7, -8) and (-2, -3) km s^-1 for the blue and the red wings, respectively. The intensity scale is in $T_{\rm A}^* {\rm d}v$ [K km s^-1] with contours from 0.09 by an increment of 0.01 K km s^-1. The filled square marks the position of IRAS 22343+7501, the solid line marks the proposed disk and the dashed line shows the orientation of the corresponding CO outflow.
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In the text

$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{FIG6.eps}}\end{figure}$ Figure 7: The observed CH₃CCH 5-4 spectra smoothed to a velocity resolution of 0.12 km s^-1. Core designation is given in the upper right corner and the observed K=0,1,2,3 transitions are marked with solid lines. The intensity scale is $T_{\rm A}^*$ [K], and the velocity scale is $v_{{\rm LSR}}$ [km s^-1].
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In the text

$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{FIG7.eps}}\end{figure}$ Figure 8: Rotation diagram of the CH₃CCH 5-4 transition for core N1a. For definition of case I (dotted line) and case II (solid line) see the text and Table 4. The error bars refer to the observational uncertainties only.
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In the text

$\begin{figure} \par\resizebox{16.0cm}{7.0cm}{\includegraphics{FIG0.eps}}\end{figure}$	Figure 1: The ¹³CO integrated intensity map of L 1251 in the (-2, -6.5) km s^-1 velocity range obtained by Sato et al. (1994). The center position is ${\rm RA}=22^{\rm h}33^{\rm m}$ ${\rm Dec}=74^\circ 58\hbox {$^\prime $ }$ (1950.0). For the designations of the regions indicated, see the Introduction. The bold-line polygon outlines the area presented in Figs. 2 - 4.
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$\begin{figure} \par\resizebox{17.0cm}{6.1cm}{\includegraphics{FIG2.eps}}\end{figure}$	Figure 3: The CS (2-1) integrated intensity map of L 1251. The velocity range of the emission, the center position, the intensity scale and markers are as in Fig. 1. Contours start from 0.65 to 1.3 by 0.13 K km s^-1 and from 1.3 to 2.34 by 0.26 K km s^-1.
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$\begin{figure} \par\includegraphics{FIG3.eps}\end{figure}$	Figure 4: The HCO⁺ (1-0) integrated intensity emission map of L 1251 for the (-2, -8) km s^-1 velocity range. The center position, the intensity scale and markers are as in Fig. 1. Contours start from 0.8 and increase by 0.45 K km s^-1.
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$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{FIG6.eps}}\end{figure}$	Figure 7: The observed CH₃CCH 5-4 spectra smoothed to a velocity resolution of 0.12 km s^-1. Core designation is given in the upper right corner and the observed K=0,1,2,3 transitions are marked with solid lines. The intensity scale is $T_{\rm A}^*$ [K], and the velocity scale is $v_{{\rm LSR}}$ [km s^-1].
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$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{FIG7.eps}}\end{figure}$	Figure 8: Rotation diagram of the CH₃CCH 5-4 transition for core N1a. For definition of case I (dotted line) and case II (solid line) see the text and Table 4. The error bars refer to the observational uncertainties only.
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