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Lecture 7: Photometry - Coggle Diagram
Lecture 7: Photometry
converting to magnitude
differential photometry
target star
comparison star
instrumental magnitude
two complications
atmosphere extinction: color dependence
A more careful instrumental to standard conversion
some important rules
photometry
apeture photometry
Counting photons that belong to a source
Subtract an estimated background count
difference image photometry
extended source photometry
SNR
Signal: counts from sources
Noise
counts from source and sky underneath, S+B
counts from estimated sky, B_{estimated}
dark current
read noise and digitization error
how to calculate:see ppt
review on CCD/CMOS