### Comparison of fits

• Before we fitted an unskewed Gaussian:
• Now we fitted a skewed Gaussian:
• The fittings are shown below:
• Parameters:
 Star (1124,513) unskewed Star (1124,513) skewed Star (180,591) unskewed Star (180,591) skewed Star (724,479) unskewed Star (724,479) skewed 1.43e-01 -1.91e-01 1.74e-01 2.34e-01 0.11 -0.04 3.07e+01 2.92e+01 2.98e+01 3.03e+01 30.1 29.4 3.07e+01 3.38e+01 3.06e+01 3.55e+01 31.5 36.3 3.86 4.28 4.18 4.30 4.29 4.37 4.00 5.38 4.43 8.02 4.77 6.97 1.41e-02 1.43e-02 1.42e-02 1.51e-02 0.80 0.80 8.65e-01 1.28e-01 0.40 -1.16 -2.62e+00 -1.51 3262 3229 3538 3412 895118 571302 Degrees of freedom 3952 3952 3952 3952 3952 3952

### Monte Carlo distribution

• With 40 images generated the histogram did not look promising:
• With a 150 images:
• Therefore, the more images used the better the follow the distribution.
• 600 images:
• And :
• Looks more like a distribution. However, there is a small peak in the middle, maybe more images will fix. Will try a 1000.
• Below are the differences in found and generated parameters for 600 images:
• New errors on parameters:
 Error Now (600 images) Errors before (150 images) 0.0009 0.0008 0.0131 0.0122 0.0201 0.0165 0.0080 0.0062 0.0125 0.0086 0.0316 0.0254 0.0410 0.0332 0.0268 0.0227
• An example with errors:
 Error Now (600 images) 0.0014 0.0009 0.087 0.013 -1.160 0.020 -0.0191 0.0080 4.28 0.01 5.38 0.03 29.2 0.04 33.8 0.03

### Observation 3: Spiral Cluster

• Took images of the spiral cluster.
• Below is a map of our image locations:
• Once realigned should look something like:
• Images we took (lum):
• Here is one of the images we captured, alognside its background (luminensce filter):
• Ran through our finding algorithm, found 72 stars:
• Some stars found are actually 2 stars.

### Observation 2: Bias, dark and light frame evolution

• The evolution before the cooling ring dissapeared:
• All bias frames:

• Decided to ignore first 20 images from the above plots to create the master bias.
• On the left is master bias that takes all 100 bias frames, on the right is one ignoring first 20 bias frames:
• All dark frames (30s):

• All flat frames (no filter):
• Kept all frames for master flat:
• Unlike last week, removed the master bias frame from each flat frame before building a master flat frame.
• On the left is last week's flat frame, on the right it is the one with master bias removed before averaging:

-- ElenaCukanovaite - 11 Feb 2016
Latex rendering error!! dvi file was not created.

Topic attachments
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png 1124_513.png r1 manage 108.0 K 11 Feb 2016 - 21:53 ElenaCukanovaite
png 1124_513_crop.png r1 manage 58.4 K 11 Feb 2016 - 21:35 ElenaCukanovaite
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png 180_591_crop.png r1 manage 60.9 K 11 Feb 2016 - 21:35 ElenaCukanovaite
png 40_chi2.png r1 manage 29.1 K 11 Feb 2016 - 22:39 ElenaCukanovaite
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png chi2.png r2 r1 manage 36.0 K 12 Feb 2016 - 08:36 ElenaCukanovaite
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png combined_map.png r1 manage 134.9 K 11 Feb 2016 - 23:48 ElenaCukanovaite
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