Peng Qiu, Guocong Wang, Xiaoming Zhang, Mingxuan Zhang, Yong Zhao, Jianfeng Wang, Xiaojun Jiang. The 2.16-m telescope polarimeter[J]. Infrared and Laser Engineering, 2023, 52(7): 20220830
- Infrared and Laser Engineering
- Vol. 52, Issue 7, 20220830 (2023)
Fig. 1. 2.16-m telescope
Fig. 2. A camera of a iKon-L DZ936 CCD (a) and its quantum efficiency curve (b)
Fig. 3. Transmittance curves of the Johnson/Bessell UBVRI filter system
Fig. 4. Schematic diagram of a dual-channel time-division imaging polarimetry
Fig. 5. Schematic diagram of the overall structure of the 2.16-m telescope polarimeter
Fig. 6. Schematic diagram of the optical path of linear polarization photometry (a) and multicolor photometry (b) of the 2.16-m telescope polarimeter
Fig. 7. Internal composition of the polarimeter
Fig. 8. Flow chart of the polarimeter
Fig. 9. Schematic diagram of a target brightness change curve when the polarizer is rotated
Fig. 10. Flow chart of polarization calibration
Fig. 11. Flow chart of polarization measurement
Fig. 12. Flow chart of multicolor photometry
Fig. 13. Schematic diagram of the proposed polarization calibration
Fig. 14. The polarimeter was installed on the focal unit of the 2.16-m telescope for on-sky testing
Fig. 15. The polarimeter observed unpolarized standard target HD14069 (a), polarized standard targets BD+64°106 (b) and VI Cyg #12 (c). An FOV of the image is about 4.63′×4.63′, the pixel scale is 0.54 (″)/pixel
Fig. 16. The polarization of the unpolarized standard target HD14069 (a), polarized standard targets BD+64°106 (b) and VI Cyg #12 (c) measured multiple times
Fig. 17. Landolt equatorial standards of 98 581, 98 L1, 98 580, 98 556, 98 557, 98 563 observed by the polarimeter
Fig. 18. Exposure times with respect to V-band magnitudes when SNR is about 141
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Table 1. Performance parameters of a iKon-L DZ936 CCD camera
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Table 2. Optical components working band of the polarimeter
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Table 3. Targets observed by the polarimeter
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Table 4. The polarization of the unpolarized standard target HD14069, polarized standard targets BD+64°106 and VI Cyg #12 measured by the polarimeter for V band. Polarimetric archival data from Schmidt, Elston & Lupie (1992) for the unpolarized and polarized (in V band) standard stars
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Table 5. Landolt equatorial standards observed by the polarimeter
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