Astronomy & Astrophysics

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$\begin{figure} \par\includegraphics[angle=270,width=17.9cm,clip]{2050fig1.eps} \end{figure}$ Figure 1: Line emission (integrated over the [3.8, 8.2] ${\rm km~s}^{-1}$ velocity range, and continuum emission towards AB Aur. The synthesized beam is indicated in each panel. The cross indicates the direction of the major and minor axis of the AB Aur disk, as derived from the analysis of the line data, but using an inclination of $30^\circ$ for the aspect ratio of the cross. Top row, left: integrated intensity of the $^{12}{\rm CO}$ J = 2 $\rightarrow$ 1 line. The angular resolution is 2.0 $\times$ 1.6'' at PA $92^\circ$ and the contour spacing is 0.85 Jy/beam ${\rm km~s}^{-1}$ or 12 $\sigma$ . Middle: integrated intensity of the $^{13}{\rm CO}$ J = 2 $\rightarrow$ 1 line. The angular resolution is 0.72 $\times$ 0.63'' at PA $29^\circ$ and the contour spacing is 85 mJy/beam ${\rm km~s}^{-1}$ or 2.2 $\sigma$ . Right: integrated intensity of the $^{13}{\rm CO}$ J = 1 $\rightarrow$ 0 line. The angular resolution is 1.37 $\times$ 1.05'' at PA $25^\circ$ and the contour spacing is 34 mJy/beam ${\rm km~s}^{-1}$ or 2.3 $\sigma$ . Bottom row, left: continuum emission at 2.8 mm. The angular resolution is 1.37 $\times$ 1.07'' at PA $27^\circ$ and the contour spacing is 0.4 mJy/beam, 28 mK, or 2.0 $\sigma$ . Middle: continuum emission at 1.4 mm. The angular resolution is 0.85 $\times$ 0.59'' at PA $18^\circ$ and the contour spacing is 1 mJy/beam, 51 mK, or 2.7 $\sigma$ . Right: integrated intensity of the ${\rm C}^{18}{\rm O}$ J = 1 $\rightarrow$ 0 line. The angular resolution is 1.37 $\times$ 1.05'' at PA $25^\circ$ and the contour spacing is 25 mJy/beam ${\rm km~s}^{-1}$ or 2.1 $\sigma$ . Coordinates are J2000.0 Right Ascension and Declination.
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In the text

$\begin{figure} \par\includegraphics[width=14.5cm,clip]{2050fig2.eps}\end{figure}$ Figure 2: Channel maps of the CO isotopologues in AB Aur. The LSR velocity, in km s^-1, is indicated in the upper left corner of each panel. Coordinates are in arsec from the star position. All data have been smoothed to the same spectral resolution, 0.25 ${\rm km~s}^{-1}$ . Top: $^{13}{\rm CO}$ J = 1 $\rightarrow$ 0 line, spatial resolution 1.37 $\times$ 1.05'' at PA $28^\circ$ , contour spacing 30 mJy/beam, or 2.1 K, or 2.2 $\sigma$ . Middle: $^{13}{\rm CO}$ J = 2 $\rightarrow$ 1 line, spatial resolution 1.00 $\times$ 0.95'' at PA $168^\circ$ , contour spacing 0.1 Jy/beam, or 2.6 K, or 2.6 $\sigma$ . Bottom: $^{12}{\rm CO}$ J = 2 $\rightarrow$ 1 line, spatial resolution 2.0 $\times$ 1.6'' at PA $92^\circ$ , contour spacing 0.5 Jy/beam, or 3.6 K, or 7 $\sigma$ . Negative contours are dashed, and the zero contour is omitted.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.8cm,clip]{2050fig3.eps}\end{figure}$ Figure 3: 1.4 mm continuum data (in contours) superimposed on the HST image from Grady et al. (1999), in grey scale. The angular resolution is 0.85 $\times$ 0.59'' at PA $18^\circ$ . The contour spacing is 0.9 mJy/beam, corresponding to 45 mK, or 2.4 $\sigma$ , with the zero contour omitted. The cross is as in Fig. 1.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.8cm,clip]{2050fig4.eps}\end{figure}$ Figure 4: Deprojected image (from an inclination of 23 $^\circ$ ) of the continuum emission of AB Aur at 1.4 mm. The black curves indicate the approximate location of the spiral arms detected by Fukagawa et al. (2004). The white curve is a possible inward spiral arm revealed by this observation. The outer ring, at 350 AU, indicates the measured outer radius of the continuum emission. The inner ring, at 280 AU, is the location of the feature observed by Pantin et al. (2005) at 20.5 $\mu$ m.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.8cm,clip]{2050fig5.eps} \end{figure}$ Figure 5: Images of the continuum 2.8 and 1.4 mm emission of AB Aur. 1.4 mm image: resolution 1.3'', contour spacing 1.3 mJy/beam (22 mK, 2 $\sigma$ ) 2.8 mm image: resolution 2.0'', contour spacing 0.6 mJy/beam (16 mK, 2 $\sigma$ ) The ellipse, at 350 AU, indicates the measured outer radius of the continuum emission.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.8cm,clip]{2050fig3.eps}\end{figure}$	Figure 3: 1.4 mm continuum data (in contours) superimposed on the HST image from Grady et al. (1999), in grey scale. The angular resolution is 0.85 $\times$ 0.59'' at PA $18^\circ$ . The contour spacing is 0.9 mJy/beam, corresponding to 45 mK, or 2.4 $\sigma$ , with the zero contour omitted. The cross is as in Fig. 1.
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$\begin{figure} \par\includegraphics[angle=270,width=8.8cm,clip]{2050fig5.eps} \end{figure}$	Figure 5: Images of the continuum 2.8 and 1.4 mm emission of AB Aur. 1.4 mm image: resolution 1.3'', contour spacing 1.3 mJy/beam (22 mK, 2 $\sigma$ ) 2.8 mm image: resolution 2.0'', contour spacing 0.6 mJy/beam (16 mK, 2 $\sigma$ ) The ellipse, at 350 AU, indicates the measured outer radius of the continuum emission.
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