The 2 channel focal reducer Fo Re Ro

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The 2 -channel focal reducer (Fo. Re. Ro 2): a new observing facility for

The 2 -channel focal reducer (Fo. Re. Ro 2): a new observing facility for the 2 -meter telescope Tanyu Bonev Institute of Astronomy Bulgarian Academy of Sciences 1. Optical parameters 2. Mechanical design 3. Modes of observations with examples 4. Conclusions

16 m f/8 0. 31 arcsec/px Focal length f ratio Scale (1 px =

16 m f/8 0. 31 arcsec/px Focal length f ratio Scale (1 px = 0. 024 mm) 5. 6 m f/2. 8 0. 88 arcsec/px

Fo. Re. Ro 2: Modes of Observations 1. Broadband imaging 2. Narrowband imaging 3.

Fo. Re. Ro 2: Modes of Observations 1. Broadband imaging 2. Narrowband imaging 3. Long slit spectroscopy 4. Fabry-Perot imaging 5. Imaging polarimetry

Fo. Re. Ro 2: Broad band imaging and photometry Available Filters: U, B, V,

Fo. Re. Ro 2: Broad band imaging and photometry Available Filters: U, B, V, R, I Example: Landolt field PG 1633+099, filter V, Exposure = 15 sec

Fo. Re. Ro 2: long slit spectrography Grating prisms (grisms) Blue Channel Red Channel

Fo. Re. Ro 2: long slit spectrography Grating prisms (grisms) Blue Channel Red Channel 600 lines/mm 300 lines/mm 0. 3 nm/px 0. 5 nm/px Long slit: Length: covers the full FOV Width: 110 microns = 1. 5 arcsec

Fo. Re. Ro 2: long slit spectrography Blue Channel < 445 nm Red Channel

Fo. Re. Ro 2: long slit spectrography Blue Channel < 445 nm Red Channel > 490 nm

Fo. Re. Ro 2: low dispersion spectra Blue Channel < 445 nm Red Channel

Fo. Re. Ro 2: low dispersion spectra Blue Channel < 445 nm Red Channel > 490 nm

Fo. Re. Ro 2: Fabry-Perot Imaging Name Kind Useful range nm Reference wavelength nm

Fo. Re. Ro 2: Fabry-Perot Imaging Name Kind Useful range nm Reference wavelength nm Free spectral range mounted Quensgate visual tunable 410 - 700 627 5. 8 Before beamsplitter Quensgate blue tunable 355 – 510 374. 7 4. 3 Before beamsplitter CSIRO visual Fixed airgap 410 -700 620 0. 21 Before beamsplitter CSIRO red Fused silica 450 -700 615 0. 26 Red arm CSIRO blue Fused silica 350 -530 400 0. 17 Blue arm

Fo. Re. Ro 2: Fabry-Perot Imaging interferogram of [OI] 6300 in comet Q 4

Fo. Re. Ro 2: Fabry-Perot Imaging interferogram of [OI] 6300 in comet Q 4 (NEAT), obtained on May 23, 2004. Interference filter + 500 micron Fabry. Perot etalon in the red channel. Exposure: 600 sec [OI] 6300 night sky emission

Fo. Re. Ro 2: Imaging polarimetry mode Optical arrangement Comet Q 4 (NEAT) 90

Fo. Re. Ro 2: Imaging polarimetry mode Optical arrangement Comet Q 4 (NEAT) 90 o +45 o -45 o 0 o

Fo. Re. Ro 2: Narrow band imaging Part of the available interference filters Blue

Fo. Re. Ro 2: Narrow band imaging Part of the available interference filters Blue channel Red channel Filters for 390 nm - CN cometary 406 nm - C 3 observations 426 nm - CO+ 443 nm - Blue Continuum … 590 nm - Na 616 nm - H 2 O+ 630 nm – [OI] 642 nm – Red Continuum … Filters of common interest [OI] - 6300 Halpha - 6563 [SII] 6716, 6731 [SIII] 3722 [SII] 4069, 4076 [OIII] 5007 … …

Narrow band imaging of comet Q 4 (NEAT) On-line, 616 nm, H 2 O+

Narrow band imaging of comet Q 4 (NEAT) On-line, 616 nm, H 2 O+ Off-line, 642 nm, Continuum -k*

Comet Q 4 (NEAT), May 26, 2004 H 2 O+ ions in the near

Comet Q 4 (NEAT), May 26, 2004 H 2 O+ ions in the near nucleus region

Comet Q 4 (NEAT), May 26, 2004 Dynamics of the H 2 O+ ions

Comet Q 4 (NEAT), May 26, 2004 Dynamics of the H 2 O+ ions in the near nucleus region 11 frames x 300 sec exposure Total time of the sequence < 1 h

Fo. Re. Ro 2: Conclusions • The 2 -channel focal reducer increases the power

Fo. Re. Ro 2: Conclusions • The 2 -channel focal reducer increases the power of the 2 -meter telescope by: 1. 2. • Changing the f ratio from f/8 to f/2. 8 Allowing simultaneous data acquisition in two spectral ranges The 2 -channel focal reducer offers several modes of observations: 1. 2. 3. 4. 5. Broad band imaging Narrow band imaging Long slit spectroscopy Fabry-Perot imaging Imaging polarimetry