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Table 1

Summary of targets and optical depths of ices.

ID # 2MASS ID Ks Spec. Type AV (CE) AK (CE) AK (SpeX) AK (SED) τ3.0 N(H2O) τ4.7 N(CO)a
[mag] (SpeX) [mag] [mag] [mag] [mag] [1017 cm-2] [1016 cm-2]
2 17312818-2631268 8.913 M5.5III 11.97 1.34 1.32 1.09 0.36 6.05 0.13 ± 0.05 9.7 ± 3.7b
6 17312249-2629585 8.256 M6III 11.21 1.26 2.63 – 0.29 4.89 <0.11 <8.9
15 17282929-2620358 8.404 M5.5III 10.04 1.12 1.13 0.99 0.23 3.93 <0.12 <9.0
1 17280535-2627053 8.982 M3III 9.54 1.07 1.13 0.96 0.25 4.26 <0.11 <8.3
9 17283130-2615350 8.156 M3III 9.52 1.07 0.99 – <0.24 <3.97 <0.62 <33.8
8 17281419-2620522 8.491 M5.5III 9.52 1.07 1.21 1.32 0.18 2.96 <0.11 <8.4
7 17282887-2617337 8.504 M6III 9.10 1.02 1.85 1.03 0.23 3.88 <0.09 <7.0
14 17281466-2627361 7.844 M5.5III 8.85 0.99 1.10 1.13 0.18 3.07 <0.16 <12.5
24 17294935-2628335 7.468 M5Ib-II 6.22 0.70 1.04 0.69 <0.23 <3.79 <0.19 <10.6
31 17311682-2557571 7.896 M5Ib-II 6.02 0.67 1.03 0.89 <0.63 <10.61 <0.25 <13.8
34 17313129-2556041 7.286 M5Ib-II 6.01 0.67 0.75 0.79 <0.23 <3.89 <0.30 <16.6
50 17294916-2608152 7.654 M5Ib-II 6.01 0.67 0.76 1.47 <0.18 <3.09 <0.28 <15.2
39 17302893-2610478 7.961 M5Ib-II 5.74 0.64 0.85 0.80 <0.60 <10.04 <0.33 <18.2
32 17312691-2559455 7.991 M6III 5.72 0.64 1.56 – <0.43 <7.26 <0.19 <10.6
52 17295176-2619482 7.841 M5.5III 5.60 0.63 0.90 1.02 <0.27 <4.60 <0.24 <13.3
44 17301059-2627445 6.795 M5Ib-II 5.31 0.59 0.89 0.76 <0.56 <9.45 <0.21 <11.8
21 17295126-2625320 7.991 M5.5III 5.14 0.58 0.70 0.67 <0.24 <4.07 <0.28 <15.1
22 17295408-2627226 7.920 M6III 5.07 0.57 1.57 – <0.47 <7.80 <0.18 <9.9
64 17285573-2641305 7.644 M3.5III 4.95 0.55 0.51 0.79 <0.34 <5.69 <0.74 <40.3
61 17284743-2634008 7.792 M6III 3.66 0.41 1.44 0.85 <0.54 <8.97 <0.20 <11.0
57 17285211-2630536 6.877 M5.5III 3.40 0.38 0.71 0.63 <0.20 <3.37 <0.26 <14.4

Notes. Ranges given as uncertainty are 1σ. Upper limits are 3σ. ID: numbering of sources given in Fig. 1. The sources are ordered according to AV (CE). AV (CE): AV by Román-Zúñiga et al. (2010) with color excess technique. AK (CE) is calculated by multiplying AV by the factor 0.112 (Rieke & Lebofsky 1985). AK (SpeX): obtained by comparing the observed SpeX spectra with the templates spectra of IRTF Spectral Library (Rayner et al. 2009). AK (SED): obtained by comparing SED with stellar model by Bressan et al. (2012). τ3.0: peak optical depth of water ice at 3.0 μm. τ4.7: peak optical depth of CO ice at 4.672 μm.

(a)

The column density of CO ice. The CO ice spectra at 4.7 μm are obtained by NIRSPEC at Keck II telescope for the sources in which the water ice is positively detected (#2, 6, 15, 1, 8, 7, 14). Other upper limits are based on SpeX/IRTF observations.

(b)

Broad absorption solution without the short-wavelength shoulder 4.655–4.665 μm included in the continuum (see Sect. 2.2.3). If the shoulder is counted as a continuum, the column density is reduced to N(CO)= (6.4 ± 3.3) × 1016 cm-2.

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