SONG Spectrograph

SONG Spectrograph
SONG Spectrograph

    The primary use of the spectrograph is to determine radial velocities of stellar surfaces for asteroseismic analysis. The spectrograph is s a high resolution echelle spectrograph operating in the range from 35.000 – 112.000 of resolution. Normal operation is around 100.000. The average dispersion is 0.02Å/pixel and the wavelength range is about 4400-6900Å with full spectral coverage at wavelengths below 5300Å. The detector used is a commercial CCD camera developed by Andor and the model is Ikon-L where the chip size is 2k x 2k. This camera has a fast readout speed of 3MHz leading to 2.3s readout time which helps to improve observing efficiency.

    The spectrograph has a dedicated guide system which uses two movable mirrors to correct for atmospheric disturbance (tip/tilt) and small misalignments in the long coudé path. The speed of which the guide system can do corrections is limited by the brightness of the targets and the frame rate at which the cameras can operate (which is about 50Hz). The optimal telescope focus is also determined by the guide system.

    An iodine cell and a Thorium-Argon lamp can be used for wavelength calibration.

    Optical Spectroscopy

    Echelle Spectrograph
    Resolution: 35000-112000

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