Table 3: The presence of the PAH features at 3.3, 6.2, 7.7 and 8.6 micron, the NAN features at 3.4 and 3.5 micron, the 11 micron complex (COMP 11) and the amorphous 10 micron silicate feature (Si 9.7) in the spectra of the sample stars. The sources are classified in 3 groups. $\surd$: detection; - : no detection; n.s.: no spectrum available at these wavelengths. $\surd^{ a}$: tentative detection; $\surd^{ b}$: tentative detection in the PHT-S spectrum; $\surd^{ c}$: feature undetected in the SWS spectrum; $\surd^{ d}$: feature undetected in the PHT-S spectrum (see Sect. 2.5). For the amorphous silicate feature, E stands for emission and A for absorption. BD+40$^\circ $4124, R CrA and LkH$\alpha $ 224 have not been classified based on the diagram in Fig. 5, which is indicated by the question mark.
Group I/II vs. IR emission bands
Object Group PAH 3.3 NAN 3.4 NAN 3.5 PAH 6.2 PAH 7.7 PAH 8.6 COMP 11 Si 9.7
V376 Cas I - - - - - - - E
Elias 3-1 I $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ E
AB Aur I - - - $\surd$ $\surd$ $\surd$ $\surd$ E
HD 34282 I - - - - $\surd$ - - -
HD 34700 I - - - $\surd$ $\surd$ $\surd$ - -
HD 97048 I $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ -
HD 100453 I $\surd$ - - $\surd$ $\surd$ $\surd^{ c}$ $\surd$ -
HD 100546 I $\surd$ $\surd^{ a}$ - $\surd$ $\surd$ $\surd$ $\surd$ E
HD 135344 I - - - $\surd^{ b}$ - - - -
HD 139614 I - - - $\surd$ $\surd$ $\surd$ $\surd$ -
HD 142527 I $\surd$ - - - - - $\surd$ E
CD-42$^\circ $11721 I $\surd$ - - $\surd$ $\surd$ $\surd$ $\surd$ -
HD 169142 I $\surd^{ d}$ - - $\surd$ $\surd$ $\surd$ $\surd$ -
T CrA I - - - - - - - E
HD 179218 I $\surd$ - - $\surd$ $\surd$ $\surd$ $\surd$ E
BD+40$^\circ $4124 I? $\surd^{ d}$ $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ $\surd$ -
HD 200775 I - - - $\surd$ - - - E
MWC 1080 I $\surd$ - - $\surd$ $\surd$ $\surd$ $\surd$ -
VX Cas II $\surd$ - - $\surd$ $\surd$ $\surd$ - E
HD 31648 II - - - $\surd$ - - - E
UX Ori II - - - - - - - E
HD 35187 II - - - - - - - -
BF Ori II - - - - - - - E
RR Tau II - - - $\surd$ $\surd$ $\surd$ $\surd$ -
HD 95881 II - - - $\surd$ $\surd$ $\surd$ $\surd$ -
HD 104237 II - - - - - - - E
HD 141569 II - - - $\surd$ $\surd$ $\surd$ - -
HD 142666 II $\surd$ - - $\surd$ - - $\surd$ E
HD 144432 II - - - $\surd^{ b}$ - - $\surd^{ c}$ E
HR 5999 II - - - - - - $\surd$ E
Wra 15-1484 II $\surd$ - - $\surd$ $\surd$ $\surd$ $\surd$ -
HD 150193 II - - - - - - $\surd$ E
AK Sco II - - - - - - - E
HD 163296 II - - - $\surd$ - - $\surd$ E
VV Ser II - - - $\surd^{ b}$ - - $\surd$ E
R CrA II? - - - - - - - E
WW Vul II - - - - - - - E
LkH$\alpha $ 224 II? - - - - - - - -
BD+46$^\circ $3471 II n.s. n.s. n.s. - - - - E
SV Cep II - - - - - - - E
Z CMa III - - - - - - - A
IRAS 12496-7650 III - - - - - - - A
MWC 297 III $\surd$ - $\surd$ $\surd$ $\surd$ - $\surd$ A
LkH$\alpha $ 225 III - - - - - - - A
PV Cep III - - - - - - - A
V645 Cyg III - - - - - - - A


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