Table 4: The observation log of the sample stars The right ascension (RA), declination (Dec) and date of the ISAAC observations are indicated. The date, UT and integration time T of the observation are given. We have assigned a quality label (Q) to the ISAAC spectra: G-good quality; L-low flux levels (<0.5 Jy); J-large flux-level jump (>50%) between the 3.3 and 3.5 micron spectrum. The seeing at $\lambda $ = 0.5 $\mu $m, estimated by the VLT Astronomical Site Monitor (ASM), is given at the time of the 3.3 and 3.5 $\mu $m ISAAC observations respectively. The final column lists the spectral calibrator stars. These standard stars have been observed during the same night as the science target, unless when flagged with $\star $.
# Target RA (2000) Dec (2000) Date UT T Q Seeing Calibrator
    hh:mm:ss dd:mm:ss dd/mm/yy hh:mm m   arcsec  
1 UX Ori 05:04:29.99 -03:47:14.3 22/10/2003 08:38 10 G 1.19 / 1.16 $\gamma$ Ori
2 HD 34282 05:16:00.48 -09:48:35.4 05/11/2003 06:15 14 G 1.10 / 1.40 $\gamma$ Ori$^\star$
3 V346 Ori 05:24:42.80 +01:43:48.3 05/11/2003 07:13 6 G 1.53 / 1.49 $\gamma$ Ori$^\star$
4 CO Ori 05:27:38.34 +11:25:38.9 28/10/2004 04:37 8 G 0.44 / 0.63 HD 212330
5 HD 35929 05:27:42.79 -08:19:38.4 03/10/2004 07:38 18 G 1.08 / 0.85 HD 38858
6 StH$\alpha$41 05:29:11.44 -06:08:05.4 03/10/2004 08:56 8 G 1.08 / 1.08 HD 38858
7 HK Ori 05:31:28.01 +12:09:10.7 09/02/2004 00:36 6 J 1.17 / 0.84 $\gamma$ Ori
8 HD 244604 05:31:57.25 +11:17:41.4 09/02/2004 01:39 6 G 0.88 / 1.07 $\gamma$ Ori$^\star$
9 RY Ori 05:32:09.96 -02:49:46.8 04/10/2004 06:34 18 G 0.57 / 0.60 HD 44594
10 T Ori 05:35:50.35 -05:28:35.1 05/11/2003 07:39 6 G 1.72 / 1.66 $\gamma$ Ori$^\star$
11 V380 Ori 05:36:25.43 -06:42:57.7 05/11/2003 08:00 6 G 1.64 / 1.60 $\gamma$ Ori$^\star$
12 V586 Ori 05:36:59.25 -06:09:16.4 05/11/2003 08:27 18 G 1.98 / 1.71 $\gamma$ Ori$^\star$
13 BF Ori 05:37:13.26 -06:35:00.6 08/10/2004 06:51 18 G 1.46 / 1.64 $\gamma$ Ori
14 HD 37357 05:37:47.08 -06:42:30.3 08/10/2004 07:24 14 G 1.56 / 1.89 $\gamma$ Ori
15 N3sk 81 05:38:09.30 -06:49:17.0 08/10/2004 09:06 14 G 1.69 / 1.86 $\gamma$ Ori
16 HD 37411 05:38:14.51 -05:25:13.3 08/10/2004 08:38 10 G 1.31 / 1.18 $\gamma$ Ori
17 Haro 13a 05:38:18.20 -07:02:26.6 28/10/2004 05:39 6 G 0.42 / 0.44 HD 38858
18 V599 Ori 05:38:58.60 -07:16:46.0 09/10/2004 08:36 12 G 0.61 / 0.76 $\epsilon$ Cen$^\star$
19 V350 Ori 05:40:11.78 -09:42:11.4 09/10/2004 05:05 18 G 1.13 / 1.48 $\epsilon$ Cen$^\star$
20 HD 37806 05:41:02.29 -02:43:00.7 28/10/2004 06:46 6 G 0.48 / 0.45 HD 38858
21 HD 250550 06:01:59.99 +16:30:56.7 12/01/2005 04:29 6 G 1.78 / 1.75 $\gamma$ Ori
22 VY Mon 06:31:06.90 +10:26:05.3 12/01/2005 04:50 4 G 2.08 / 2.00 $\gamma$ Ori
23 LkH$\alpha$215 06:32:41.80 +10:09:33.6 21/01/2005 01:55 8 G 0.76 / 0.70 $\xi$ Ori
        26/02/2005 02:08 8   1.20 / 1.42 $\rho$ Cen
24 HD 259431 06:33:05.19 +10:19:20.0 21/01/2005 02:54 6 G 0.88 / 0.79 $\lambda $ Lep
        25/02/2005 03:42 6   0.67 / 0.57 $\epsilon$ Cen
25 R Mon 06:39:09.89 +08:44:10.0 10/01/2005 05:32 6 G 0.96 / 0.72 $\gamma$ Ori
26 V590 Mon 06:40:44.57 +09:48:02.1 10/01/2005 03:46 28 G 0.73 / 1.94 $\gamma$ Ori
27 GU CMa 07:01:49.51 -11:18:03.3 01/03/2004 03:48 6 J 0.66 / 0.84 $\epsilon$ Cen
28 HD 53367 07:04:25.53 -10:27:15.7 12/02/2005 05:45 6 G 1.00 / 0.76 $\beta$ Cir
        19/11/2003 08:15 6   0.50 / 0.51 $\gamma$ Ori$^\star$
29 NX Pup 07:19:28.26 -44:35:11.3 09/02/2004 05:04 6 G 0.81 / 0.85 $\gamma$ Ori
30 HD 76534 08:55:08.71 -43:27:59.9 11/01/2005 04:54 18 G 2.03 / 1.85 $\nu$ Pup
31 HD 85567 09:50:28.54 -60:58:03.0 20/01/2005 09:06 6 G 0.64 / 0.59 $\pi$ Sco
32 HD 95881 11:01:57.62 -71:30:48.4 23/01/2005 05:34 6 G 0.81 / 0.76 $\xi^2$ Cen
33 HD 97048 11:08:03.32 -77:39:17.5 18/07/2004 01:01 6 G 0.55 / 0.63 $\epsilon$ Cen$^\star$
34 HD 100546 11:33:25.44 -70:11:41.2 27/07/2004 23:49 6 G 1.24 / 1.41 $\kappa$ Eri
35 HD 101412 11:39:44.46 -60:10:27.7 28/07/2004 00:20 8 G 1.33 / 1.29 $\kappa$ Eri
36 T Cha 11:57:13.53 -79:21:31.5 18/07/2004 01:26 10 J 0.88 / 0.71 $\epsilon$ Cen$^\star$
37 LSS 3027 B 13:19:03.98 -62:34:10.1 10/05/2004 05:39 8 L 0.78 / 0.90 $\epsilon$ Cen
38 HD 130437 14:50:50.26 -60:17:10.3 10/05/2004 06:03 8 G 0.93 / 0.84 $\epsilon$ Cen
39 SS73 44 15:03:23.80 -63:22:59.0 05/09/2003 01:08 8 G 0.83 / 0.95 $\kappa$ Cet$^\star$
40 HD 132947 15:04:56.05 -63:07:52.6 05/09/2003 01:35 8 L+J 0.88 / 0.93 $\kappa$ Cet$^\star$
41 HD 141569 15:49:57.75 -03:55:16.4 22/08/2004 23:15 8 J 0.72 / 0.73 $\sigma $ Sco
42 HD 142666 15:56:40.02 -22:01:40.0 23/08/2004 00:53 6 J 0.96 / 0.96 $\sigma $ Sco
43 HD 142527 15:56:41.89 -42:19:23.3 05/09/2003 02:05 6 G 1.32 / 0.91 $\kappa$ Cet$^\star$
44 HR 5999 16:08:34.29 -39:06:18.3 22/07/2004 03:46 6 J 1.61 / 1.82 HD 172910
45 HD 150193 16:40:17.92 -23:53:45.2 10/05/2004 06:50 6 G 0.83 / 0.86 $\kappa$ Aql
46 AK Sco 16:54:44.85 -36:53:18.6 10/05/2004 07:15 8 G 0.85 / 0.89 $\kappa$ Aql
47 V921 Sco 16:59:06.90 -42:42:08.0 22/07/2004 03:01 6 G 1.76 / 1.82 HD 172910
48 KK Oph 17:10:08.07 -27:15:18.2 22/07/2004 03:26 8 J 1.39 / 1.36 HD 172910
49 HD 163296 17:56:21.29 -21:57:21.9 19/09/2003 02:07 6 G 1.54 / 1.74 $\kappa$ Cet
50 MWC 297 18:27:39.60 -03:49:52.0 19/09/2003 02:27 4 G 1.67 / 1.64 $\kappa$ Cet
51 VV Ser 18:28:47.87 +00:08:39.6 19/09/2003 02:46 6 G 1.42 / 1.32 $\kappa$ Cet
52 MWC 300 18:29:25.69 -06:04:37.3 19/09/2003 03:02 6 G 1.42 / 1.45 $\kappa$ Cet
53 AS 310 18:33:21.17 -04:58:06.7 19/09/2003 03:26 14 L 1.57 / 1.28 $\kappa$ Cet
54 S CrA 19:01:08.60 -36:57:20.0 19/09/2003 03:48 8 G 1.49 / 1.39 $\kappa$ Cet
55 TY CrA 19:01:40.83 -36:52:33.9 19/09/2003 04:08 8 G 1.14 / 1.04 $\kappa$ Cet
56 R CrA 19:01:53.65 -36:57:07.6 19/09/2003 04:27 6 G 0.83 / 0.91 $\kappa$ Cet
57 T CrA 19:01:58.80 -36:57:49.0 26/09/2003 01:38 8 G 0.99 / 1.24 BY Cap
58 HD 179218 19:11:11.25 +15:47:15.6 01/10/2003 02:01 6 G 0.63 / 0.66 HD 9562
59 HBC 687 19:29:00.80 +09:38:43.0 26/09/2003 02:08 20 L 1.11 / 1.12 HD 9562
60 V1295 Aql 20:03:02.52 +05:44:16.7 19/09/2003 04:46 6 G 0.78 / 0.90 $\kappa$ Cet

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