Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
en:praktikum:photometrie [2021/04/06 17:01] – [2. Alternative] rhainich | en:praktikum:photometrie [2023/09/19 06:52] (current) – rhainich | ||
---|---|---|---|
Line 1: | Line 1: | ||
- | ====== N2 - Photometry of open star clusters ====== | + | ====== N2 - Photometry of open star clusters |
/* | /* | ||
Line 240: | Line 240: | ||
The script can be executed in the terminal with the following command | The script can be executed in the terminal with the following command | ||
- | | + | |
Afterwards, a figure, showing the CMD, can be found in the current directory. The file type of this figure can be set via the variable '' | Afterwards, a figure, showing the CMD, can be found in the current directory. The file type of this figure can be set via the variable '' | ||
Line 297: | Line 297: | ||
Afterwards, recompile and run your //GDL// program once more. Then save and run the //Python// script from a console: | Afterwards, recompile and run your //GDL// program once more. Then save and run the //Python// script from a console: | ||
- | | + | |
An image " | An image " | ||
Line 349: | Line 349: | ||
As previously described, the file '' | As previously described, the file '' | ||
- | ./plot_cmd.py | + | python |
It also offers the possibility to include isochrones, which can be downloaded from the websites of various stellar evolution projects. The variables of the script '' | It also offers the possibility to include isochrones, which can be downloaded from the websites of various stellar evolution projects. The variables of the script '' | ||
Line 421: | Line 421: | ||
===== Report ===== | ===== Report ===== | ||
+ | |||
+ | A usual report is to be handed in. See a general overview about the required structure and content [[https:// | ||
+ | |||
+ | For this experiment, the theoretical overview in the report should describe open and globular cluster with emphasis on the observed kind, and their differences to other accumulations and groups of stars. Explain Hertzsprung-Russell diagrams (HRD) and the color-magnitude diagrams (CMD) and the difference between them. //Shortly// describe the evolution of stars of different masses in the context of a HRD. Explain the concepts of isochrones and the turn-off point and how one estimates the age of a cluster using them. | ||
+ | |||
+ | In the methods section describe the observations and the data reduction, highlight points that deviate from general description in here and list all the parameters you set for the extraction. Further, include all the plots of the data reduction in the report (a few in the text, most of them in the appendix). Describe the calibration procedure and list the stars you use and the shifts you determine. Also include any parameters for reddening, extinction, and distance that you adopt from the literature. | ||
+ | |||
+ | The results part presents the cluster CMDs and describes the observable features in it. | ||
+ | |||
+ | The analysis of the CMDs contains the estimation of the cluster age based on the turn-off point and an isochrone fit. | ||
+ | |||
+ | Finally, discuss your findings. Bring your results into a larger context and make a literature comparison when possible (i.e., for the cluster age). This also includes that you identify potential problems with the data, the data reduction, or the analysis (especially the isochrone fit) and possible solutions for them. Are their inconsistencies? | ||
+ | |||
+ | //**Note:** The plots of the individual orders are in large files which generally do not fit into an email appendix. You may upload your report to the [[https:// | ||
+ | |||
+ | /* | ||
+ | **OLD BELOW** | ||
Describe the difference between globular clusters and open clusters, with special emphasis on the character of the observed object. Discus the differences of stellar clusters and general accumulations/ | Describe the difference between globular clusters and open clusters, with special emphasis on the character of the observed object. Discus the differences of stellar clusters and general accumulations/ | ||
+ | */ | ||
[[en: | [[en: | ||