Table A.1
Overview of applied calibrations and transformations between the photometric instrumental systems of IRSF and NACO into the 2MASS system.
| Band | Photometric calibration | Number of stars used (after last clipping) |
|
|
||
| IRSF single epoch | ||
| J | JIRSF,2MASS = 22.854 ± 0.005 + JIRSF,inst − 0.046 (JIRSF,inst − HIRSF,inst) + 0.015 | 279 |
| H | HIRSF,2MASS = 22.919 ± 0.003 + HIRSF,inst + 0.016 (JIRSF,inst − HIRSF,inst) + 0.024 | 451 |
| Ks | KIRSF,2MASS = 22.146 ± 0.003 + KIRSF,inst + 0.010 (JIRSF,inst − KIRSF,inst) + 0.014 | 502 |
|
|
||
| NACO epoch 1 | ||
| Zeropoints calibrated against IRSF | ||
| using star “1” (adopted) stars “1” + “2” | ||
| J | 24.247 ± 0.018 + JNACO,inst | (24.254 ± 0.007) |
| H | 24.012 ± 0.017 + HNACO,inst | (23.987 ± 0.028) |
| Ks | 23.128 ± 0.017 + KNACO,inst | (23.105 ± 0.020) |
|
|
||
| NACO epoch 2 | ||
| Zeropoints calibrated against IRSF | ||
| using star “1” (adopted) stars “1” + “2” | ||
|
|
||
| J | 24.315 ± 0.018 + JNACO,inst | (24.345 ± 0.030) |
| H | 24.024 ± 0.017 + HNACO,inst | (24.030 ± 0.060) |
| Ks | 23.067 ± 0.017 + KNACO,inst | (23.091 ± 0.023) |
|
|
||
| Zeropoints aligned with respect to epoch 1 [within 4′′ of target] | ||
| J | 24.289 ± 0.019 + JNACO,inst | 8 |
| H | 24.036 ± 0.012 + HNACO,inst | 10 |
| Ks | 23.116 ± 0.008 + KNACO,inst | 10 |
Notes. The derived zeropoints for NACO are consistent with zeropoints from NACO based on regularly taken standard stars (after correction for atmospheric extinction) and that we do not find a color term between the NACO and 2MASS system.
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