Here are my errors using the ISIS automatic calibration on lamp lines only (Heliocentric and RV corrected). It confirms what I have generally been finding with low errors at the red end increasing at the blue end. As expected the lines in the lamp spectrum are in exactly the right place (to better than +-0.5A). I also had a look at Hugh’s lines in my calibrated lamp spectrum and where different lines are used they are still exactly in the right place so it does not seem to be dependent on the lines used. (Note I could not use the 6562.85 lamp line (H alpha) as the Hydrogen has all leaked from my lamp which is a few years old now)
Cheers
Robin
| lamp lines | HD206165 | ALPY calib | |
| wavelength | error | ||
| 7383.98 | 7065.2 | -0.1 | |
| 7147.04 | 6678.2 | 0.2 | |
| 6506.53 | 6562.8 | -0.3 | |
| 6266.49 | 5875.7 | 0.2 | |
| 5852.49 | 4921.9 | -0.5 | |
| 5400.56 | 4861.3 | -0.7 | |
| 4965.08 | 4387.9 | -0.6 | |
| 4764.87 | 4340.5 | -0.5 | |
| 4657.9 | 4101.7 | -1.0 | |
| 4545.05 | 4026.2 | -2.3 | |
| 4510.73 | 3970.1 | -3.0 | |
| 4158.59 | 3888.6 | -2.8 | |
| 3946.1 | 3835.4 | -3.6 | |
| 3797.9 | -4.0 | ||
| 3770.6 | -4.0 | ||
| 3750.1 | -4.2 |