All Figures

$\begin{figure} \par {\includegraphics[width=16.8cm,clip]{2891f1.eps} }\end{figure}$ Figure 1: ISOCAM raster images used for the FC-027 field: LW5 (7 $\mu$ m, left) and LW9 (15 $\mu$ m, right). The rectangular frames show the limits of the "regular'' field, as defined in Schuller et al. (2003) - see also Eq. (1). The dotted lines show the limits of the area included in the Glass et al. (2001) survey (see Sect. 3.1): only the area to the left of these lines was observed by Glass et al. (2001). North and east directions are indicated.
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In the text

$\begin{figure} \par {\includegraphics[width=7.6cm,clip]{2891f2.eps} }\end{figure}$ Figure 2: [15] vs. [7]-[15] colour magnitude diagram for the FC-027 field. Sources located inside the area also observed by Glass et al. (2001) are shown with black symbols, while those outside the Glass et al. (2001) area are indicated with gray symbols. The sources associated with LPVs are indicated by plus signs, OH/IR stars are shown with crosses, and sources where an 86 GHz SiO maser was detected are shown with square symbols. The thick lines show the loci of giant stars (continuous line), supergiants (dotted line), M-type AGB stars and L-type stars with different mass-losses (dashed line) in this diagram, as computed using synthetic spectra (Cohen, private communication). The extinction vector in the bottom right corner corresponds to $A_{\rm V}=30$ mag; it was computed using the mean values of $A_\lambda /A_{\rm V}$ for the LW5 and LW9 filters derived by Jiang et al. (2006).
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In the text

$\begin{figure} \par {\includegraphics[width=7.6cm,clip]{2891f3.eps} }\end{figure}$ Figure 3: [15] vs. [7]-[15] colour magnitude diagram for all sources with 7 $\mu$ m and 15 $\mu$ m detections and reliable 7-15 $\mu$ m associations in the FC-027 field. The sources associated with radio sources or with H II regions detected by IRAS are indicated with various symbols, as indicated in the top left corner.
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In the text

$\begin{figure} \par {\includegraphics[width=8cm,clip]{2891f4.eps} }\end{figure}$ Figure 4: Positions of IRAS point sources found in the FC-027 field. The gray scale background shows the 15 $\mu$ m ISO image. Every IRAS source is shown with its name, and the 3 $\sigma$ uncertainty ellipse. The IRAS field of view at 12 and 25 $\mu$ m ( $0.76\times 4.55$ arcmin²) is also shown with dotted lines.
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In the text

$\begin{figure} \par {\includegraphics[width=7.3cm,clip]{2891f5.eps} }\end{figure}$ Figure 5: Distributions of differences in magnitudes between ISOGAL and MSX: ISO 7 $\mu$ m-MSX A-band ( top), ISO 15 $\mu$ m-MSX D-band ( middle), and ISO 7-15 colour-MSX A-D colour ( bottom).
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In the text

$\begin{figure} \par {\includegraphics[width=8cm,clip]{2891f6.eps} }\end{figure}$ Figure 6: MSX colour-magnitude diagrams of the FC-027 field: [15] vs. [8]-[15] ( top) and [15] vs. [15]-[21] ( bottom). Sources identified with known H II regions, as derived from IRAS or radio continuum measurements, are shown with square symbols, and those associated with LPV or OH/IR stars are shown with $\times$ symbols or diamonds, respectively. The grey crosses show the positions of MSX sources without ISOGAL counterparts within 8''. The dotted line in the bottom panel corresponds to a flux ratio F_E/F_D=2 (see text).
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In the text

$\begin{figure} \par {\includegraphics[width=8.5cm,clip]{2891f7.eps} }\end{figure}$ Figure 7: Colour magnitude diagram for all sources in the FC-027 field, showing the results of near-infrared spectroscopic classification. Sources with spectra of YSO or hot stars are shown with square symbols, while those with AGB or RGB spectra are shown with $\times$ or large plus symbols, respectively. Sources with AGB spectra also associated with LPV or OH/IR stars are indicated with diamond or triangle symbols, respectively.
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In the text

$\begin{figure} \par {\includegraphics[width=16.8cm,clip]{2891f8.eps} }\end{figure}$ Figure 8: Summary colour magnitude diagram for all sources detected at 7 and 15 $\mu$ m in the FC-027 field. The symbols show the positions in this diagram of sources identified with known objects (LPVs, OH/IR, IRAS and radio H II regions), and those with near-infrared spectral classification. Sources with MSX associations with flux ratios F_E/F_D>2 are indicated with open circles, also when detected in E but not in D. The dotted lines show the limits [7]-[15] = 2 and [15] = 4.5 (see text).
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In the text

$\begin{figure} \par {\includegraphics[width=8.5cm,clip]{2891f9.eps} }\end{figure}$ Figure 9: $\sigma _{15}$ vs. [7]-[15] diagram for all sources detected at both wavelengths and brighter than [15] = 4.5 in FC-027. The sources associated with AGB stars are shown with cross symbols, and those associated with young objects (IRAS H II regions or radio sources) are indicated with square symbols. Sources with MSX associations with F_E/F_D>2 are indicated with open circles. The dotted line shows the criteria that we have used to extract candidate young objects from the ISOGAL catalogue (Sect. 4.1).
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{2891f10.eps} }\end{figure}$ Figure 10: MSX colour colour diagram for all sources associated with ISOGAL in FC-027. The YSO candidates that we selected from this field are indicated with square and triangle symbols. Sources associated with LPV or OH/IR stars are shown with crosses and diamonds. The dotted horizontal line corresponds to F_E/F_D=2, and the dashed lines show the criteria used by Lumsden et al. (2002).
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In the text

$\begin{figure} \par {\includegraphics[width=8.2cm,clip]{2891f11.eps} }\end{figure}$ Figure 11: Contour plots of the ISOCAM LW5 (7 $\mu$ m, black contours) and LW9 (15 $\mu$ m, white contours) around ( $\alpha$ , $\delta$ ) = ( $\rm 17^h45^m05^s$ , $-29^{\circ }16'50''$ ). The LW5 contours correspond to flux densities of 40, 60, 80, 110, 150, 200 and 300 mJy/pixel, and the LW9 contours correspond to 60, 100, 140, 180, 220 and 260 mJy/pixel. The crosses and letters indicate the positions of extracted ISOGAL sources, and details are given in Table 2. The ellipse drawn with thick dashed line shows the position and size (FWHM) of the radio source LS95 7. The very bright source at the limit of the field to the north is associated with LS95 8.
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In the text

$\begin{figure} \par {\includegraphics[width=15.4cm,clip]{2891f12.eps} }\end{figure}$ Figure 12: Distribution in galactic coordinates of our 46 candidates. All 2043 sources from the ISOGAL catalogue are represented with small dots. The 32 candidates with 7 and 15 $\mu$ m detections are shown with plus signs, and the 14 candidates only seen at 15 $\mu$ m with crosses. Sources with IRAS counterparts are indicated by triangles and those with radio continuum by squares (see also the IRAS uncertainty ellipses in Fig. 4). The sources associated with MSX point sources are shown with small diamonds. The contours show the radio continuum emission at 1.6 GHz (data were kindly provided by Dr. H. S. Liszt), with levels at 0., 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.15, 0.2 and 0.25 Jy/beam.
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In the text

$\begin{figure} \par {\includegraphics[width=7.6cm,clip]{2891f3.eps} }\end{figure}$	Figure 3: [15] vs. [7]-[15] colour magnitude diagram for all sources with 7 $\mu$ m and 15 $\mu$ m detections and reliable 7-15 $\mu$ m associations in the FC-027 field. The sources associated with radio sources or with H II regions detected by IRAS are indicated with various symbols, as indicated in the top left corner.
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$\begin{figure} \par {\includegraphics[width=8cm,clip]{2891f4.eps} }\end{figure}$	Figure 4: Positions of IRAS point sources found in the FC-027 field. The gray scale background shows the 15 $\mu$ m ISO image. Every IRAS source is shown with its name, and the 3 $\sigma$ uncertainty ellipse. The IRAS field of view at 12 and 25 $\mu$ m ( $0.76\times 4.55$ arcmin²) is also shown with dotted lines.
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$\begin{figure} \par {\includegraphics[width=7.3cm,clip]{2891f5.eps} }\end{figure}$	Figure 5: Distributions of differences in magnitudes between ISOGAL and MSX: ISO 7 $\mu$ m-MSX A-band ( top), ISO 15 $\mu$ m-MSX D-band ( middle), and ISO 7-15 colour-MSX A-D colour ( bottom).
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$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{2891f10.eps} }\end{figure}$	Figure 10: MSX colour colour diagram for all sources associated with ISOGAL in FC-027. The YSO candidates that we selected from this field are indicated with square and triangle symbols. Sources associated with LPV or OH/IR stars are shown with crosses and diamonds. The dotted horizontal line corresponds to F_E/F_D=2, and the dashed lines show the criteria used by Lumsden et al. (2002).
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