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- Title
Upgradation of AIMPOL Instrument on the 104-cm Sampurnanand Telescope of ARIES.
- Authors
Pandey, Jeewan C.; Singh, Sadhana; Yadav, R. K. S.; Nanjappa, Nandish; Pant, Jayshreekar; Kumar, Mukesh; Sahu, Sanjit
- Abstract
We present a recent upgradation of the ARIES IMaging POLarimeter (AIMPOL) mounted on the 104 cm Sampurnanand telescope of ARIES, Nainital since 2004. AIMPOL is upgraded by replacing the older detector with a new CCD, Pylon 1300B and the older sliding filter assembly with an automatic wheel filter assembly. A characterization of this CCD is performed and several CCD parameters like gain, read-out noise, dark current, and linearity are verified. The average value of the bias offset is measured to be ∼600 ADU whereas the dark current is measured to be 0.2 e−/pixel/h at − 1 2 0 ∘ C. The CCD can be operated safely between − 7 0 ∘ C to − 1 2 0 ∘ C due to the almost constant dark current in this temperature range. The nonlinearity of the CCD is measured to be ∼2%, which is suitable for scientific observations. A few polarimetric observations are also taken using the upgraded AIMPOL. The degree of polarization and position angle of a few standard polarized stars are found to be similar to their standard and previously observed values.
- Subjects
TELESCOPES; POLARISCOPE; POLARIZATION (Social sciences); DETECTORS; TEMPERATURE
- Publication
Journal of Astronomical Instrumentation, 2023, Vol 12, Issue 2, p1
- ISSN
2251-1717
- Publication type
Article
- DOI
10.1142/S2251171722400086