Difference: StewartBoogertPhotometry20170125 (1 vs. 3)

Revision 325 Jan 2017 - LauraBevilacqua

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Minimum separation of stars
Line: 26 to 25
 
    • V: c=-8.28699220211
  • HR diagram (cutoff applied to real data):
  • RealHR_cutoff.png
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  • Plotted fraction of stars found out of the number of expected stars for different star finding thresholds
  • The threshold is set as the mode+maxSigma*n where n isn't necessarily an integer, values of n are shown on the x axis of the plot below
  • fractionStars.png
 -- AaronAndrews - 23 Jan 2017

META FILEATTACHMENT attachment="minDistHistogram_vTrue.png" attr="" comment="minimum separation histogram, true v data" date="1485213346" name="minDistHistogram_vTrue.png" path="minDistHistogram_vTrue.png" size="29207" user="zyva010" version="2"
Line: 33 to 35
 
META FILEATTACHMENT attachment="RealHR_cutoff.png" attr="" comment="Double cluster HR, real data compared to true, cutoff" date="1485298104" name="RealHR_cutoff.png" path="RealHR_cutoff.png" size="97301" user="zyva010" version="1"
META FILEATTACHMENT attachment="RealHR_full.png" attr="" comment="Double cluster HR, real data compared to true, full" date="1485298121" name="RealHR_full.png" path="RealHR_full.png" size="136568" user="zyva010" version="1"
META FILEATTACHMENT attachment="latex4cdceefe56dca3dbdb32b84fdcb4880b.png" attr="h" comment="" date="1485298290" name="latex4cdceefe56dca3dbdb32b84fdcb4880b.png" user="zyva010" version="1"
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META FILEATTACHMENT attachment="fractionStars.png" attr="" comment="Fraction of stars found, using the star finder, for different thresholds" date="1485340847" name="fractionStars.png" path="fractionStars.png" size="31030" user="zyvb786" version="2"

Revision 224 Jan 2017 - AaronAndrews

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Minimum separation of stars
Line: 8 to 8
 
  • Mode: 5.1634
  • FWHM: 5.6489
  • Smallest minimum distance: 0.2643
Added:
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Preliminary HR for true data
 
Added:
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  • Ran preliminary analysis on Double cluster images from observation 2, made HR diagram.
  • Magnitude calculated using equation:
 \begin{equation} m = -2.5 \log_{10}\left ( \frac{ADU_{total} \times gain / t_{exp}}{F_{vega}} \right )+c \end{equation}

Filter Flux at m=0 (photons s^-1 m^-2)
B 4260*1.51e7/0.22
V 3640*1.51e7/0.16
R 3080*1.51e7/0.23
  • (Note: flux sometimes measured in units of Jy, 'jansky', where 1Jy=1.51e7 (dLambda/Lambda)^-1. This is shown above. Source:http://www.astro.utoronto.ca/~patton/astro/mags.html)
  • For best match to real data, calculated offset c for both B and V filters:
    • B: c=-8.14300827674
    • V: c=-8.28699220211
  • HR diagram (cutoff applied to real data):
  • RealHR_cutoff.png
 -- AaronAndrews - 23 Jan 2017

META FILEATTACHMENT attachment="minDistHistogram_vTrue.png" attr="" comment="minimum separation histogram, true v data" date="1485213346" name="minDistHistogram_vTrue.png" path="minDistHistogram_vTrue.png" size="29207" user="zyva010" version="2"
META FILEATTACHMENT attachment="minDistHistogram_vCand.png" attr="" comment="histogram of minimum distances, real candidate V data" date="1485212531" name="minDistHistogram_vCand.png" path="minDistHistogram_vCand.png" size="26285" user="zyva010" version="1"
Added:
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>
META FILEATTACHMENT attachment="RealHR_cutoff.png" attr="" comment="Double cluster HR, real data compared to true, cutoff" date="1485298104" name="RealHR_cutoff.png" path="RealHR_cutoff.png" size="97301" user="zyva010" version="1"
META FILEATTACHMENT attachment="RealHR_full.png" attr="" comment="Double cluster HR, real data compared to true, full" date="1485298121" name="RealHR_full.png" path="RealHR_full.png" size="136568" user="zyva010" version="1"
META FILEATTACHMENT attachment="latex4cdceefe56dca3dbdb32b84fdcb4880b.png" attr="h" comment="" date="1485298290" name="latex4cdceefe56dca3dbdb32b84fdcb4880b.png" user="zyva010" version="1"

Revision 123 Jan 2017 - AaronAndrews

Line: 1 to 1
Added:
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META TOPICPARENT name="StewartBoogertPhotometry2016"
Minimum separation of stars

  • Need threshold for position matching of stars between frames.
  • For each star in true visual data for Double Cluster (), determined minimum separation to adjacent star. Constructed histogram:
  • minDistHistogram_vTrue.png
  • Mode: 5.1634
  • FWHM: 5.6489
  • Smallest minimum distance: 0.2643

-- AaronAndrews - 23 Jan 2017

META FILEATTACHMENT attachment="minDistHistogram_vTrue.png" attr="" comment="minimum separation histogram, true v data" date="1485213346" name="minDistHistogram_vTrue.png" path="minDistHistogram_vTrue.png" size="29207" user="zyva010" version="2"
META FILEATTACHMENT attachment="minDistHistogram_vCand.png" attr="" comment="histogram of minimum distances, real candidate V data" date="1485212531" name="minDistHistogram_vCand.png" path="minDistHistogram_vCand.png" size="26285" user="zyva010" version="1"
 
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