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en:praktikum:sternspektren_baches [2023/09/11 12:54] – [Data reduction] rhainich | en:praktikum:sternspektren_baches [2024/03/20 09:29] (current) – [Plotting the spectrum] rhainich | ||
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Flatdarks/ | Flatdarks/ | ||
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There are different tools to view the FITS files (two dimensional CCD images or data tables). //ds9// is easy to handle and can be started from the terminal via: | There are different tools to view the FITS files (two dimensional CCD images or data tables). //ds9// is easy to handle and can be started from the terminal via: | ||
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If you want to mirror the recordings you have to set '' | If you want to mirror the recordings you have to set '' | ||
+ | **Important: | ||
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===== Data analysis ===== | ===== Data analysis ===== | ||
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In this case, the script should be stopped by entering a '' | In this case, the script should be stopped by entering a '' | ||
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- | A solid method is to gradually reduce the number of orders until the script executed successfully. Afterwards, the flatfield with the identified orders will be displayed in an external window (see below). It should be checked whether the marks of the orders are horizontal and whether they coincide with the actual orders that are visible on the flatfield. The left figure shows a successful test run, whereas the middle figure depicts a failure. The right figure shows a flatfield image taken with the QHY268M, where it can happen that //MIDAS// does not finish drawing all identified orders. From the order numbers, however, it can be assessed if all orders were successfully identified or not. | + | A solid method is to gradually reduce the number of orders until the script executed successfully. Afterwards, the flatfield with the identified orders will be displayed in an external window (see below). It should be checked whether the marks of the orders are horizontal and whether they coincide with the actual orders that are visible on the flatfield. The left figure shows a successful test run, whereas the middle figure depicts a failure. The right figure shows a flatfield image taken with the QHY268M, where it can happen that //MIDAS// does not finish drawing all identified orders. From the order numbers, however, it can be assessed if all orders were successfully identified or not. The numbers also depend on whether the images are binned. As we usually use 2x2 binning, the above values should suffice. In case we have used 1x1 binning for the spectra however, you might have to double the second and third value. |
<WRAP group> | <WRAP group> | ||
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{{section> | {{section> | ||
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+ | **Important: | ||
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The spectrum should be plotted by means of the python script '' | The spectrum should be plotted by means of the python script '' |