Extraction and Calibration 1.Find the spectrum 2.Define the extraction window and the background windows 3. Trace the center of spatial profile as a function of the dispersion axis 4.Sum the spectrum within the extraction window 5.Subtracting sky 6.Wavelength Calibration 7.Flux Calibration
Extraction and Calibration 1. Find the spectrum 2. Define the extraction window and the background windows 3. Trace the center of spatial profile as a function of the dispersion axis 4. Sum the spectrum within the extraction window 5. Subtracting sky 6. Wavelength Calibration 7. Flux Calibration
[1]frame.1.1:obj068-Imc1-559 spatial axis ⊙ night line sky ★ stellar spectrum 器
Parameters for Extraction in IRAF Extracting the Spectrum apall Parameters: Parameters Controlling the Extraction Aperture line=INDEF nsum=10 width=10 lower=-5 upper=5 resize=no Parameters Controlling the Background Windows B_sample=-20:-8,8:20 b_naver=-100 b_funct=chebyshev b order=2 Parameters Controlling the Trace t_nsum=10 t_step=10t_funct=spline3 t niter=1 Parameters Controlling the Summation and Background Subtraction Background=fit weights=variances clean=yes saturation=32400... Parameters Controlling The Output Format Format=multispec extras=yes
Parameters for Extraction in IRAF n Extracting the Spectrum : apall n Parameters: q Parameters Controlling the Extraction Aperture line=INDEF nsum=10 width=10 lower=-5 upper=5 resize=no q Parameters Controlling the Background Windows B_sample=-20:-8,8:20 b_naver=-100 b_funct=chebyshev b_order=2 q Parameters Controlling the Trace t_nsum=10 t_step=10 t_funct=spline3 t_niter=1 q Parameters Controlling the Summation and Background Subtraction Background=fit weights=variances clean=yes saturation=32400 … q Parameters Controlling The Output Format Format=multispec extras=yes
Parameters Controlling the Extraction Aperture line=INDEF nsum=10 width=10 lower=-5 upper=5 resize=no NUA0/IRAF V2.10BEIA massey@tofu Tue T2:51:40 14-Jan-92 Image=obj068.Sum of columns 594-603 Define and Edit Apertures 25000 20000 5000 0000 5000 0 50 100 150 200 250 300
Parameters Controlling the Extraction Aperture line=INDEF nsum=10 width=10 lower=-5 upper=5 resize=no
Parameters Controlling the Background Windows B sample=-20:-8,8:20 b naver=-100 b funct=chebyshev b order=2 NORO/IRAF V2.T0BETA massey@tofu Tue 13:19:34 14-Jan-92 func=chebyshev.order=1.low_rej=3.high_rej=3.niterate=0.grow=0 total=321,sample=2,rejected=0,deleted=0,RMS= 9.95 Set Background Subtraction for Aperture 1 25000 20000 15000 10000 人 5000 -20 -10 0 10 20 Line
2022/5/6 孔旭 20 Parameters Controlling the Background Windows B_sample=-20:-8,8:20 b_naver=-100 b_funct=chebyshev b_order=2