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UKIRT BRIGHT STANDARDS

OLD, BRIGHT, UKIRT STANDARDS - OUTDATED

The table below lists data that have been outdated by more recent results. See other links available from the calibrations homepage for further information on how the current system relates to previous UKIRT photometric systems, colours, choice of standard stars, etc. The stars listed here are generally too bright for modern work at JHK and the data were obtained using filters sets that are quite different from current filters.

- Revised list MMC 3/3/92

The magnitudes in this list have been revised following 1990/91 UKT9 photometry. Asterisks refer to the most frequently re-observed stars. The results define the UKIRT/UKT9 natural photometric system. The K zeropoint is defined as identical to that of the CIT (Elias) system for A0 stars. Transformations to CIT are given in the appendix.

  NAME      Sp        RA  (1950)  DEC          J     H     K     L     L'    M

*HD 225023 A0      0  0 11.8   35 32 14.0   7.082 6.993 6.962  6.94  6.96  7.03
*G158-27   M5      0  4 12.0   -7 47 54.0   8.378 7.781 7.447        7.04      
*BS 33     F7V     0  8 43.2  -15 44 32.0   3.964 3.689 3.636  3.60  3.60      
*HD 1160   A0      0 13 23.1    3 58 24.0   7.060 7.051 7.040  7.05  7.04      
 HD 2811   A2      0 28 53.0  -43 52 58.0   7.178 7.093 7.067  7.04            
 HD 3029   A3      0 31  2.3   20  9 30.0   7.263 7.125 7.093        7.06      

 BS 337    M0III   1  6 55.5   35 21 22.0  -0.908-1.703-1.853 -2.00 -1.98 -1.75
 BS 696    B2Iae   2 21 43.1   56 23  4.0   5.587 5.499 5.443  5.37  5.33  5.31
*BS 718    B9III   2 25 29.8    8 14 13.0   4.374 4.390 4.390  4.40  4.41  4.38
 BS 739    gG3     2 29 36.6   -1 15 17.0   3.748 3.218 3.121        3.04      
 BS 740    F4IV    2 29 43.0  -15 27 48.0   3.879 3.623 3.585  3.56  3.56      
*GL 105.5  M0      2 38  7.6    0 58 57.0   7.305 6.663 6.539  6.47  6.46      

 BS 816    gF0     2 42 43.4    4 30  8.0   5.502 5.384 5.353        5.38      
 HD 18881  A0      3  0 20.5   38 12 53.0   7.130 7.135 7.140  7.15  7.14  7.29
 HD 19904  A2      3  8 49.1  -39 14 24.0   6.727 6.662 6.642  6.62            
 G77-31    M4?     3 10 40.5    4 35 12.0   8.816 8.187 7.857  7.52            
*HD 22686  A0      3 36 18.7    2 36  7.0   7.196 7.190 7.185  7.20  7.19      
 BS 1140   B7IV    3 41 49.5   24  8  1.0   5.520 5.500 5.510  5.60  5.64  5.64

 BS 1457   K5III   4 33  2.9   16 24 37.0  -1.848-2.614-2.783 -2.97 -2.89 -2.76
 BS 1543   F6V     4 47  7.4    6 52 32.0   2.353 2.117 2.095        2.07      
 BS 1552   B2III   4 48 32.4    5 31 16.0   4.029 4.087 4.138  4.18  4.18  4.15
 BS 1641   B7V     5  3  0.2   41 10  8.0   3.518 3.646 3.677  3.71  3.74  3.77
 BS 1637   F0V     5  6 40.6   51 35 52.0   4.312 4.204 4.153  4.11  4.14  4.13
 BS 1713   B8Iae   5 12  8.0   -8 15 29.0   0.240 0.241 0.211  0.13  0.09  0.09

 BS 1708   G4III   5 12 59.5   45 56 58.0  -1.334-1.717-1.802 -1.87 -1.85 -1.79
 SAO112626 F8      5 16 41.4    1 39 15.0   8.934 8.670 8.596        8.65      
 BS 1869   dF0     5 36 15.9   47 42 56.0   5.532 5.454 5.393  5.36  5.39  5.37
 HD 38921  A0      5 45 41.0  -38 14 51.0   7.572 7.551 7.536  7.53            
*HD 40335  A0      5 55 37.6    1 51  9.0   6.555 6.473 6.452  6.43  6.43  6.41
 BS 2228   F0V     6 17 34.6   46 25 57.0   6.012 5.943 5.892  5.84  5.88  5.85

*HD 44612  A0      6 21  9.7   43 34 35.0   7.075 7.041 7.041  7.04  7.03      
 BS 2491   A1V     6 42 56.7  -16 38 46.0  -1.300-1.319-1.320 -1.35 -1.36 -1.38
*BD+0 1694 ?       6 52  7.3    0  0 52.0   5.750 4.857 4.606  4.43  4.43      
 BS 2721   G0V     7 12  7.6   47 19 51.0   4.475 4.180 4.126        4.08      
 BS 2943   F5IV    7 36 41.1    5 21 16.0  -0.437-0.564-0.646 -0.66       -0.66
 BS 2990   K0IIIb  7 42 15.6   28  8 55.0  -0.523-0.975-1.050 -1.15 -1.17 -1.09

 BS 3314   A0V     8 23  9.7   -3 44 31.0   3.920 3.919 3.940  3.94  3.92      
 HD 75223  A0      8 45 29.8  -39 36 54.0   7.329 7.296 7.281  7.26            
*HD 77281  A2      8 59  5.4   -1 16 45.0   7.111 7.052 7.031  7.00  7.06  6.97
*GL 347A   M3.5    9 26 25.0   -7  8 30.0   8.483 7.881 7.658  7.41  7.36      
*HD 84800  A2      9 45 35.9   43 53 56.0   7.592 7.549 7.538  7.55  7.54  7.58
 BS 3888   F2IV    9 47 27.1   59 16 30.0   3.162 3.005 2.983  2.98  2.94  2.94

  NAME      Sp        RA  (1950)  DEC          J     H     K     L     L'    M

 BS 3903   G7III   9 49  4.3  -14 36 40.0   2.617 2.136 2.050  1.98            
 V 569     M3     10  9 46.3   -3 29 41.0   5.992 5.310 5.106  4.93  4.89      
 BS 4069   M0III  10 19 21.5   41 45  6.0   0.132-0.654-0.803 -0.94 -0.96 -0.63
 GL 390    M1.5   10 22 44.0   -9 58 36.0   6.939 6.275 6.061  5.87            
 GL 406    M6     10 54  6.0    7 19 12.0   7.143 6.469 6.099  5.69            
 BS 4358   K3III  11 11 25.9    8 20  5.0   3.879 3.299 3.202        3.14      

 HD101452  A2     11 37 45.1  -38 52  9.0   7.018 6.890 6.848  6.81            
 Y 2730    dM4.5  11 45  8.2    1  5 56.0   6.532 5.935 5.646  5.34  5.26      
 BS 4550   G8V    11 50  6.2   38  4 39.0   4.957 4.466 4.400  4.35  4.38  4.41
 HD105601  A2     12  6 56.1   38 54 39.0   6.821 6.719 6.687  6.64  6.65  6.66
*HD106965  A2     12 15 24.0    1 51 10.0   7.380 7.337 7.316  7.30  7.34  7.30
*BS 4689   A2IV   12 17 20.8    0 23 21.0   3.810 3.781 3.781  3.79  3.79  3.78

 BS 4935   F7V    13  1  5.1  -20 18 55.0   4.604 4.290 4.266                  
 BS 4983   G0V    13  9 32.5   28  7 52.0   3.194 2.929 2.886  2.88  2.89  2.88
 BS 5340   K1IIb  14 13 22.8   19 26 31.0  -2.200-2.878-2.976 -3.09 -3.05 -2.91
*BS 5447   F2V    14 32 30.2   29 57 41.0   3.723 3.522 3.489  3.48  3.49  3.47
 HD129653  A2     14 40 38.2   36 58  7.0   6.985 6.942 6.921  6.91  6.93  7.07
*HD129655  A2     14 41 11.0   -2 17 38.0   6.826 6.724 6.692  6.67  6.68      

 HD130163  A0     14 44 36.2  -39 43  4.0   6.856 6.846 6.835  6.81            
 BD+3 2954 M0     14 52 23.2    3 11 33.0   5.926 5.026 4.825  4.64            
 BS 5685   B8V    15 14 18.7   -9 11 59.0   2.759 2.789 2.799        2.85  2.88
*HD136754  A0     15 19 24.3   24 31 19.0   7.155 7.146 7.135  7.14  7.14      
*BD+2 2957 K2     15 22 29.0    1 41  6.0   5.280 4.454 4.263  4.08  4.19      
 BS 6084 B2II+O9V 16 18  8.7  -25 28 29.0   2.491 2.442 2.421  2.43  2.42  2.42

*BS 6092   A9III  16 18 14.1   46 25 54.0   4.192 4.257 4.298        4.35  4.38
 S-R 3     ?      16 23  7.7  -24 27 26.0   7.804 7.001 6.543  6.25            
 OPH S1    ?      16 23 32.8  -24 16 44.0   9.007 7.344 6.378  5.71            
 BS 6136   K4III  16 26  0.9    0 46 32.0   2.898 2.184 2.036  1.86            
 BS 6147   G8IIIa 16 28 16.4  -16 30 19.0   2.767 2.334 2.269  2.19  2.22  2.28
 BS 6406   M5Ib   17 12 22.0   14 26 45.0  -2.276-3.110-3.351 -3.70 -3.66 -3.44

 HD161743  A0     17 45 31.8  -38  6 11.0   7.620 7.620 7.615  7.61            
*HD161903  A2     17 45 43.3   -1 47 34.0   7.172 7.059 7.023  6.99  7.01  7.14
*HD162208  A0     17 46 20.7   39 59 40.0   7.223 7.141 7.112  7.09  7.14  7.12
 BS 6707   F2II   17 56 35.3   30 11 32.0   3.470 3.252 3.210  3.16  3.18  3.17
*Y 4338    dM4.5e 18 46 44.1  -23 53 32.0   6.297 5.680 5.416  5.12  5.03      
 BS 7120   K3II   18 52  5.8  -22 44  8.0   2.739 2.120 2.033  1.91            

*GL 748    dM4    19  9 38.0    2 48 36.0   7.105 6.557 6.319  6.05  6.00      
 BS 7615   K0III  19 54 25.7   34 56 58.0   2.199 1.716 1.640  1.51  1.56  1.65
*BS 7773   B9.5V  20 17 53.5  -12 55  4.0   4.825 4.859 4.859  4.86  4.86      
*GL 811.1  dM4    20 54  4.0  -10 37 36.0   7.832 7.185 6.946  6.70  6.69  6.68
*HD201941  A2     21 10 13.6    2 26 12.0   6.696 6.657 6.626  6.60  6.61      
 BS 8143   B9Iab  21 15 27.0   39 11  4.0   3.886 3.838 3.797  3.73  3.73  3.69
*HD203856  A0     21 21 37.1   39 48 12.0   6.926 6.887 6.861  6.84  6.84      

 HD205772  A3     21 35 33.6  -41 16 26.0   7.775 7.688 7.657  7.64            
 SAO34401  F0     22 21 47.7   54 57 12.0   7.933 7.766 7.734        7.74      
*BS 8541   B9Iab  22 22 29.0   49 13 21.0   4.305 4.267 4.235  4.23  4.22  4.22
 BS 8551   K0III  22 25 19.6    4 26 39.0   2.956 2.378 2.312  2.25  2.24  2.32
*Y 5546    dM5    22 50 36.2  -14 31 34.0   5.980 5.344 5.066  4.80  4.74      

                               Appendix
                               --------

           TRANSFORMATION RULES FROM UKIRT (UKT9) TO CIT (Caltech)

   The CIT system is taken as that defined by Elias et al (1982, A.J. 
87,1029). The UKIRT system is that defined by the UKIRT standards list, 
observed by UKT9.

   Transformation equations are

         Kcit = Kukirt - 0.018*(J-K)
   ( J-K )cit = 0.936 * ( J-K )ukirt
   ( H-K )cit = 0.960 * ( H-K )ukirt
   ( J-H )cit = 0.920 * ( J-H )ukirt
   ( K-L )cit = 0.820 * ( K-L )ukirt


   Although IRCAM has a different filter set to that of UKT9, no 
significant systematic differences have been found between IRCAM photometry 
and the UKIRT system out to a J-K colour of ~ 1 (Longmore, Priv. Comm). So 
IRCAM can be considered to be on the UKIRT system for this colour range.

Contact: Watson P. Varricatt. Updated: Mon Oct 4 14:33:59 HST 2004

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