Table 2
The results for τ9.7 and E(J − K) measured for the sources in our sample.
| Target name | Spectral type | Diffuse/Molecular | ( |
(J − K)obs | E(J − K) | τ 9.7 | Power-law index |
|
|
|||||||
| StRS 136 | B8–A9I2 | D | 0.12 | 1.78 | 1.66 ± 0.1 | 0.65 ± 0.05 | −2.00 |
| StRS 164 | B8–A9I2 | D | 0.12 | 1.78 | 1.66 ± 0.1 | 0.62 ± 0.05 | −2.03 |
| SSTc2d_J182835.8+002616 | ... | M (Serpens) | 0.81 | 3.78 | 2.97 ± 0.40 | 0.73 ± 0.05 | −2.25 |
| [SVS76] Ser 9 | ... | M (Serpens) | 0.81 | 4.33 | 3.52 ± 0.40 | 0.74 ± 0.05 | −2.27 |
| StRS 354 | O7–B32 | D | −0.09 | 1.88 | 1.97 ± 0.1 | 0.58 ± 0.04 | −1.73 |
| Elias 3-13 | K2III3 | M (Taurus) | 0.73 | 3.01 | 2.28 ± 0.05 | 0.42 ± 0.04 | −2.15 |
| SSTc2d_J163346.2−242753 | ... | M (ρ Ophiuchi) | 0.81 | 2.45 | 1.64 ± 0.25 | 0.45 ± 0.05 | −1.28 |
Notes. The target name, spectral type (if known) and the type of sightline (diffuse, D, or molecular, M) are listed. If the spectral type is unknown we assume it is a G0–M4 giant. The corresponding intrinsic J − K colour, (J − K)int, and the J − K colour as observed by 2MASS, (J − K)obs, are also listed. The difference between these two values gives the colour excess E(J − K). The last two columns list the the measured optical depth at 9.7 μm, τ9.7, and the index of the power-law used to determine the continuum around 10 μm.
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