Difference: StewartBoogertPhotometry20171201 (1 vs. 2)

Revision 230 Nov 2017 - RebekahChafer1

Line: 1 to 1
Deleted:
<
<
 

Star Field Simulation

Stot distribution changed to a skewed Gaussian so there are more dim stars than bright stars

Changed:
<
<		Accept-reject_monte_carlo_Stot_Skewed_distribution.png
>
>		Accept-reject_monte_carlo_Stot_Skewed_distribution.png

Shape function fixed to be more realistic. Adds the effect of an unfocused image.

Unfocused_Image.png

Also, a globular option was implemented.

Globular_Simulation.png

Tested the ability of the star finding algorithm with dense star fields

Analysis_of_Density_of_Stars.png

Star_Density_Analysis.png

Profiles of Stars

Simulated Data

Profile_of_Multiple_Simulated_Stars.pngZoomedIn.png

The sigma for these two stars when using two separate sigma parameters in fit are 8.987 and 9.072, which corresponds to a size of 5.47'' and 5.52''. In comparison, the FWHM corresponds to 6.51''.

This was repeated for real data

RealDataMultiple_stars.png

The sigma for these stars are 1.8413 and 1.8473 pixels, which correspond to a size of 1.12'' and 1.13''.

 
META FILEATTACHMENT attachment="Accept-reject_monte_carlo_Stot_Skewed_distribution.png" attr="" comment="Stot Distribution" date="1512066232" name="Accept-reject_monte_carlo_Stot_Skewed_distribution.png" path="Accept-reject monte carlo Stot Skewed distribution.png" size="83999" user="zavc984" version="1"
Changed:
<
<
META FILEATTACHMENT attachment="Profile_of_Multiple_Simulated_Stars.png" attr="" comment="Bright and dim simulated stars fit to a Gaussian Sum" date="1512066286" name="Profile_of_Multiple_Simulated_Stars.png" path="Profile of Multiple Simulated Stars.png" size="33188" user="zavc984" version="1"
>
>
META FILEATTACHMENT attachment="Profile_of_Multiple_Simulated_Stars.png" attr="" comment="Profile of multiple stars from simulated data" date="1512079919" name="Profile_of_Multiple_Simulated_Stars.png" path="Profile of Multiple Simulated Stars.png" size="33188" user="zavc984" version="1"
META FILEATTACHMENT attachment="Globular_Simulation.png" attr="" comment="" date="1512076060" name="Globular_Simulation.png" path="Globular Simulation.png" size="4245" user="zavc984" version="1"
META FILEATTACHMENT attachment="Unfocused_Image.png" attr="" comment="Simulated unfocused star field" date="1512079244" name="Unfocused_Image.png" path="Unfocused Image.png" size="18179" user="zavc984" version="1"
META FILEATTACHMENT attachment="Star_Density_Analysis.png" attr="" comment="Plot of density of star field versus the difference between counted stars and true value" date="1512079418" name="Star_Density_Analysis.png" path="Star Density Analysis.png" size="66740" user="zavc984" version="1"
META FILEATTACHMENT attachment="Analysis_of_Density_of_Stars.png" attr="" comment="Plot of Counted Stars versus true number of stars" date="1512079595" name="Analysis_of_Density_of_Stars.png" path="Analysis of Density of Stars.png" size="64851" user="zavc984" version="1"
META FILEATTACHMENT attachment="ZoomedIn.png" attr="" comment="Zoomed in image of dimmer star from graph" date="1512079946" name="ZoomedIn.png" path="ZoomedIn.png" size="30007" user="zavc984" version="1"
META FILEATTACHMENT attachment="RealDataMultiple_stars.png" attr="" comment="Profile of multiple stars from real data" date="1512080230" name="RealDataMultiple_stars.png" path="RealDataMultiple stars.png" size="33931" user="zavc984" version="1"

Revision 130 Nov 2017 - RebekahChafer1

Line: 1 to 1
Added:
>
>

Star Field Simulation

Stot distribution changed to a skewed Gaussian so there are more dim stars than bright stars

Accept-reject_monte_carlo_Stot_Skewed_distribution.png

META FILEATTACHMENT attachment="Accept-reject_monte_carlo_Stot_Skewed_distribution.png" attr="" comment="Stot Distribution" date="1512066232" name="Accept-reject_monte_carlo_Stot_Skewed_distribution.png" path="Accept-reject monte carlo Stot Skewed distribution.png" size="83999" user="zavc984" version="1"
META FILEATTACHMENT attachment="Profile_of_Multiple_Simulated_Stars.png" attr="" comment="Bright and dim simulated stars fit to a Gaussian Sum" date="1512066286" name="Profile_of_Multiple_Simulated_Stars.png" path="Profile of Multiple Simulated Stars.png" size="33188" user="zavc984" version="1"
View topic | History: r2 < r1 | More topic actions...
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback