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Table 1:

Coordinates, LIRIS photometry and spectral classification of the selected objects within NGC 7538.
Name ID RA (J2000) Dec (J2000) J H $K_{\rm s}$ $A_{\rm V}$(mag) Class. ST Notes
                     
IRS 6   23 13 34.3 +61 30 14.3 8.71 $\pm$ 0.02$^{\dag }$ 8.21 $\pm$ 0.04$^{\dag }$ 8.00 $\pm$ 0.01$^{\dag }$ 5.4 $\pm$ 0.4   O3$\pm$1V O9 $\pm$ 1V$^{\ddag }$
IRS 5   23 13 30.3 +61 30 11.6 10.38 $\pm$ 0.03$^{\dag }$ 9.82 $\pm$ 0.04$^{\dag }$ 9.43 $\pm$ 0.04$^{\dag }$ 7.6 $\pm$ 0.6   O9 $\pm$ 1V O3 $\pm$ 1V$^{\ddag }$
  #35 23 13 47.336 +61 27 53.74 18.18 $\pm$ 0.03 14.62 $\pm$ 0.01 12.55 $\pm$ 0.01 35.0 $\pm$ 0.2   B1.5-B3V  
  #25 23 13 43.820 +61 29 28.37 13.41 $\pm$ 0.01 12.33 $\pm$ 0.01 11.83 $\pm$ 0.02 9.3 $\pm$ 0.3   B2-B7V  
  #17 23 13 31.933 +61 27 47.40 13.83 $\pm$ 0.01 12.38 $\pm$ 0.01 11.59 $\pm$ 0.01 13.6 $\pm$ 0.2   B5-B9V  
  #63 23 13 45.058 +61 27 53.88 18.13 $\pm$ 0.05 15.14 $\pm$ 0.03 13.18 $\pm$ 0.01 - YSO - H2
  #6 23 13 43.498 +61 29 37.31 11.97 $\pm$ 0.01 10.87 $\pm$ 0.01 9.73 $\pm$ 0.03 - YSO - neb
  #14 23 13 44.538 +61 27 15.19 14.89 $\pm$ 0.02 12.81 $\pm$ 0.02 11.39 $\pm$ 0.01 - YSO - neb, Br-abs
  #11 23 13 30.688 +61 29 07.47 17.50 $\pm$ 0.04 13.78 $\pm$ 0.01 11.15 $\pm$ 0.01 - YSO - H2, neb
IRS 4 #2 23 13 32.219 +61 29 07.32 11.40 $\pm$ 0.01 10.43 $\pm$ 0.05 9.43 $\pm$ 0.09 - YSO - neb
  #23 23 13 34.240 +61 29 09.62 14.13 $\pm$ 0.01 12.74 $\pm$ 0.01 11.78 $\pm$ 0.02 - FL -  
  #36 23 13 45.380 +61 28 04.19 20.09 $\pm$ 0.14 15.25 $\pm$ 0.03 12.61 $\pm$ 0.01   FL -  
  #18 23 13 57.268 +61 28 15.63 15.58 $\pm$ 0.01 13.15 $\pm$ 0.01 11.67 $\pm$ 0.01 - FL -  
IRS 3 #26 23 13 43.620 +61 28 14.00 16.82 $\pm$ 0.04 13.67 $\pm$ 0.03 11.95 $\pm$ 0.03 29.7 $\pm$ 0.7 II -  
  #12 23 13 33.537 +61 28 49.80 15.72 $\pm$ 0.07 12.92 $\pm$ 0.07 11.10 $\pm$ 0.04 - Herbig Be -  
  #55 23 13 38.488 +61 28 47.59 15.98 $\pm$ 0.02 13.98 $\pm$ 0.01 12.92 $\pm$ 0.02 16.0 $\pm$ 0.3 PMS G9 $\pm$ 1PMS  
  #39 23 13 40.766 +61 28 28.20 14.98 $\pm$ 0.01 13.33 $\pm$ 0.01 12.54 $\pm$ 0.01 11.6 $\pm$ 0.2 PMS K1 $\pm$ 1PMS  
  #58 23 13 31.325 +61 30 22.24 15.12 $\pm$ 0.01 13.73 $\pm$ 0.01 12.98 $\pm$ 0.01 10.3 $\pm$ 0.2 PMS K1 $\pm$ 1PMS neb Br$\gamma$
  #41 23 13 33.391 +61 29 35.77 14.43 $\pm$ 0.01 13.15 $\pm$ 0.01 12.56 $\pm$ 0.01 7.9 $\pm$ 0.3 PMS K1 $\pm$ 1PMS/III  
  #15 23 13 57.238 +61 27 47.40 14.95 $\pm$ 0.01 12.60 $\pm$ 0.01 11.56 $\pm$ 0.01 16.5 $\pm$ 0.2   G8 $\pm$ 1III  
  #46 23 13 34.218 +61 30 17.64 14.18 $\pm$ 0.07 13.03 $\pm$ 0.09 12.66 $\pm$ 0.08 4.9 $\pm$ 1.4   KO $\pm$ 1III  
  #60 23 13 44.280 +61 28 10.10 15.68 $\pm$ 0.01 13.91 $\pm$ 0.01 13.05 $\pm$ 0.03 11.9 $\pm$ 0.6   K2 $\pm$ 1III H2
IRS 7 #4 23 13 36.801 +61 30 39.59 8.44 $\pm$ 0.04$^{\dag }$ 7.63 $\pm$ 0.04$^{\dag }$ 7.37 $\pm$ 0.01$^{\dag }$ 2.6 $\pm$ 0.6   K0 $\pm$ 1III  

Notes. YSO: young stellar object; FL: featureless spectrum; PMS: pre-main-sequence. $^{(\dag )}$ Photometry from the 2MASS Point Source Catalog; $^{(\ddag )}$ classification by Russeil et al. (2007).


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