Double-wedged Wollaston-type polarimeter design and integration to RTT150-TFOSC; initial tests, calibration, and characteristics

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HELHEL S., Khamitov I., KAHYA G., BAYAR C., KAYNAR S., Gumerov R.

EXPERIMENTAL ASTRONOMY, cilt.39, sa.3, ss.595-604, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 39 Sayı: 3
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/s10686-015-9468-8
  • Dergi Adı: EXPERIMENTAL ASTRONOMY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.595-604
  • Anahtar Kelimeler: WeDoWo, Polarimeter, RTT150, TFOSC-WP, TUG, Imaging polarimetry, POLARIZATION STANDARDS, TELESCOPE, OBJECTS, DEVICE
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Photometric and spectroscopic observation capabilities of 1.5-m Russian-Turkish Telescope RTT150 has been broadened with the integration of presented polarimeter. The well-known double-wedged Wollaston-type dual-beam technique was preferred and applied to design and produce it. The designed polarimeter was integrated into the telescope detector TFOSC, and called TFOSC-WP. Its capabilities and limitations were attempted to be determined by a number of observation sets. Non-polarized and strongly polarized stars were observed to determine its limitations as well as its linearity. An instrumental intrinsic polarization was determined for the 1 x 5 arcmin field of view in equatorial coordinate system, the systematic error of polarization degree as 0.2 %, and position angle as 1.9(a similar to). These limitations and capabilities are denoted as good enough to satisfy telescopes' present and future astrophysical space missions related to GAIA and SRG projects.

The observational facility of 1.5m Russian-Turkish Telescope RTT150 including highly

precise positional measurements, photometry and spectroscopy has been broadened

with polarimetry. New device was made on the base of Double Wedged Wollaston of

well known dual-beam technique. The optic unit was integrated to TFOSC system

which is a main telescope detector. Newly designed TFOSC-WP polarimeter capability

was investigated by observations of set non-polarized and strongly polarized stars. The

recommended working area with linear behavior of instrumental intrinsic polarization is

determined

as 1 by 5 arcmin in equatorial coordinate system. The instrumental systematic error of

polarization degree is 0.2% and position angle is 1.9 degree. The polarimeter

integration to the RTT150 has increased its capabilities in ground-based observational

support of present and future astrophysical space missions such as GAIA and SRG,

which is one of a primary goal of the telescope.