The SOFIN Echelle spectrograph

SOFIN was originally a joint project of Crimean and Helsinki Observatories.

SOFIN is a high-resolution Echelle spectrograph provides a resolution of R=27000-170000. SOFIN also offers spectropolarimetry.

As of period 57, SOFIN is only offered to do circular spectro-polarimetry with the medium-resolution (R~80,000) camera.

SOFIN is not a common-user instrument, but is only supported during fixed periods by Dr. Ilya Ilyin (ilyin@aip.de), AIP, Potsdam and/or Dr. Jyri Lehtinen (lehtinen@mps.mpg.de), MPS, Göttingen. Before applying, prospective users should obtain explicit approval for the use of SOFIN from Dr. Thomas Hackman (thomas.hackman@helsinki.fi), from the University of Helsinki, and Dr. Maarit Käpylä (kapyla@mps.mpg.de), from the Max Planck Institute in Göttingen.

• The newer concise SOFIN Observing Manual (2018)
• The SOFIN User's Manual (1993)
• SOFIN 3A Reference Guide (1997)
• SOFIN 3A User's Guide (1997)
• See also Ilya Ilyin's SOFIN Homepage which contains more information.

• The paper where the description of the polarimeter is given in sect.7.1: 2012, AN 333, 213
• Ilya Ilyin's PhD thesis (2000) where the detailed description of SOFIN is given.

• Filling SOFIN
  

SOFIN efficiency

• Loral
  
• EEV7
  

Some examples of SOFIN spectra

• II Peg image - 2nd camera, pre-processed image.
  
• Lamp image - 2nd camera, raw data image.
  
• RY Tau image - 3rd camera, prior to optimal extraction of spectra.