Aaron - Image offset parameter investigation: Offset_Parameters.pdf

Summary:

• Needed to determine accurate offsets (position and rotation transform) of images.
• Matched ~30 brightest stars for each image in the Dragonfly cluster (blue filter), comparing to first image in set.
• Constructed chi-square to compare measured positions in one image to transformed measured positions in offset image.
• Performed modified least squares fit.

• Error on magnitudes now involves scaling parameters

• 
  
• where m is the initial magnitude before scaling, c is the intercept in the linear fit (from last meeting) and g is the gradient of the linear fit
• Laura - m_scaled.pdf

• Double Cluster HR of a single frame:
  

• 96 stars, maximum mag = 13.623

• Double Cluster HR of a stacked frame:
  
• 85 stars, maximum magnitude = 13.300
• Lower star count in stacked frames possibly due to the stacking of read-out noise in each frame
• Dragonfly Cluster HR using scaling parameters from the Double Cluster

• Dragonfly Cluster HR using dragonfly scaling parameters

• 210217.pdf: Anisha's Real data analysis (draft)