Table D.1.
Calibrator stars for the S-cluster
| Epoch | S1 | S2 | S4 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H | K | L | M | H | K | L | M | H | K | L | M | |
| 2004 | - | - | 14.2 | - | 15.9 | 14.0 | 13.5 | - | - | - | 13.9 | - |
| 2006 | 16.4 | 14.6 | 12.6 | - | 15.8 | 13.9 | 12.4 | - | 16.1 | 14.4 | 12.7 | - |
| 2008 | 16.5 | 14.6 | 12.5 | - | 15.6 | 14.1 | 12.3 | - | 16.2 | 14.4 | 12.6 | - |
| 2010 | 16.4 | 14.6 | 13.1 | - | 15.9 | 14.2 | 13.4 | - | 16.1 | 14.4 | 14.0 | - |
| 2012 | 16.5 | 14.6 | 12.7 | 12.6 | 16.1 | 14.1 | 11.4 | 12.8 | 16.2 | 14.4 | 12.6 | 13.1 |
| 2016 | 16.5 | 14.7 | - | - | - | - | 12.4 | - | 16.2 | 14.5 | - | - |
| Mean | 16.5 | 14.6 | 13.0 | 12.6 | 15.9 | 14.1 | 12.6 | 12.8 | 16.2 | 14.4 | 13.1 | 13.1 |
| Std | 0.1 | 0.1 | 0.6 | 0.4 | 0.1 | 0.1 | 0.7 | 0.1 | 0.1 | 0.1 | 0.6 | 0.2 |
Notes: For the K-band values, we use an extinction of AK = 2.4 adopted from Fritz et al. (2011) and a correction factor of 0.2 mag for the K’ and KS magnitude (Sabha et al. 2010). For these values, we use the nonvariable star IRS16NW and IRS2L as reference sources. For 2016, no H-band observations carried out with NACO are available. Due to corrupt calibration data for the K-band observations in 2016, we excluded this epoch from this list. The H- and K-band magnitudes for S1 and S4 are determined with S2 as the reference star and SINFONI H+K data between 2006 and 2016. As pointed out by Hosseini et al. (2020), some magnitude variation of S2 is expected.
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