T CrB increase in the UV
Posted: Sat Mar 24, 2018 8:14 pm
Hello,
I've observed in the past 2 days that T CrB become prominent in the UV down to 3620A (unsure exactly when) during the past year, and it seems to be unusual when browsing back in the ARAS DB (or maybe just this region is missing): In order to doublecheck calibrations before reporting this UV event (IR, wavelength of the Alpy), I've made an experiment repeating the range 3620A - 4200A by using LHires 600/mm 35u slit (3 x 20 minute of LHires vs 3 x 5 minute of the Alpy): I did take care of enlarging width for gathering up defocused photons at the edges, resolution is best in the middle.
Also made several checks with the LHires (taken also Vega for IR calibration) about wavelengths.
It works also as a proof now that my Alpy still properly calibrated for wavelength in the UV.
In case this UV increase would turn to be important, please let me know.
- Peter
I've observed in the past 2 days that T CrB become prominent in the UV down to 3620A (unsure exactly when) during the past year, and it seems to be unusual when browsing back in the ARAS DB (or maybe just this region is missing): In order to doublecheck calibrations before reporting this UV event (IR, wavelength of the Alpy), I've made an experiment repeating the range 3620A - 4200A by using LHires 600/mm 35u slit (3 x 20 minute of LHires vs 3 x 5 minute of the Alpy): I did take care of enlarging width for gathering up defocused photons at the edges, resolution is best in the middle.
Also made several checks with the LHires (taken also Vega for IR calibration) about wavelengths.
It works also as a proof now that my Alpy still properly calibrated for wavelength in the UV.
In case this UV increase would turn to be important, please let me know.
- Peter