Week 3 – GOC

This week has been very focused on getting the code finished and error free so that we can move onto the next stage of our project. Emma and Harry have been working on the code, with Emma managing to clear up some of the noise on the H-R diagram that she had produced the week before with data given to us (shown below).

On the left is the image from last week, and the one on the right is the image without as much noise. This noise is thought to be stars not in the cluster but still picked up by SExtractor. Currently, Emma is working on the code that gives the errors for each H-R Diagram, as the errors provided to us by SExtractor aren’t as accurate as we’d hope. These errors will allow us to find the errors on our calculated Age, Distance and Metallicity once we have gone through analysis.

Harry has also been working very hard on the code this week, carrying on from his successes the week before. SCAMP has been giving him some issues, to the point where our Monday time in the Astrolabs was mainly Harry fighting a MAC. SCAMP is some software which combines all 4 of our CCD’s back into one image post reduction. This was considered fairly easy until it was implanted into the code and it just hasn’t worked. However given some advice from David and the weekend to work over it, Harry should have it finished by Monday.

Coding has not been all the science that has been done this week, with the rest of us completing the Manual Photometry, with all of us finishing it and moving onto the next part of the project, Literature Search! We split the sections of interest into 6 topics, specifically looking into Metallicity, how to account for interstellar reddening from dust, and how to calculate the ages. Tom was successful in finding an article online which includes code to account for reddening, then plots an isochrone from which one can find the age and distance from. This can be done by shifting our data onto the isochrone then calculating our information from the amount shifted, however this needs to be investigated further.

Finally, Tom, Alex, Matthew and I have begun writing up parts of our theory to start putting into the report, with a plan to construct the bar bones of it on overleaf on Monday so we can begin to conclude our group project.


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