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This section describes the procedure to make a position-velocity diagram at a specific wavelength of the echelle spectrum in order to derive the spatial information along the slit.
For this purpose, firstly, the spectrum of each order is traced and then extracted as a spectrum preserved its positional information along the slit length. The curvature and inclination of the spectra are corrected.
Secondly, the curvature and inclination of slit images are corrected and the wavelength is calibrated for each two-dimensional image.
The data reduction was performed with the Image Reduction Analysis Facility (IRAF).
General reduction procedure of spectra with IRAF was introduced in several documentations (Valdes, 1986; Massey, Valdes, & Barnes, 1992; Willmarth & Barnes, 1994).
Subsections
Tae-Soo Pyo
2003-05-29