An automated pipeline for photometric calibration and measurements
Mattila, Aleksi (2022-10-20)
Mattila, Aleksi
A. Mattila
20.10.2022
© 2022 Aleksi Mattila. Ellei toisin mainita, uudelleenkäyttö on sallittu Creative Commons Attribution 4.0 International (CC-BY 4.0) -lisenssillä (https://creativecommons.org/licenses/by/4.0/). Uudelleenkäyttö on sallittua edellyttäen, että lähde mainitaan asianmukaisesti ja mahdolliset muutokset merkitään. Sellaisten osien käyttö tai jäljentäminen, jotka eivät ole tekijän tai tekijöiden omaisuutta, saattaa edellyttää lupaa suoraan asianomaisilta oikeudenhaltijoilta.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202210203528
https://urn.fi/URN:NBN:fi:oulu-202210203528
Tiivistelmä
Measuring magnitudes from astronomical images can be slow and difficult when done by hand, especially if there’s a large amount of targets or images that need to be analysed. To aid in this effort, Autophotometer, an automatic pipeline for photometric measurements and calibrations was developed. Autophotometer was made with Python, and it uses Source Extractor and SCAMP from Astromatic. The photometric calibrations are performed using data from Pan-STARRS1 and 2MASS surveys.
This master’s thesis describes the technical details of the pipeline and how it was used to study cataclysmic variables. Over 350 images of cataclysmic variables in multiple filters taken with the Nordic Optical Telescope were processed with the program to evaluate its performance and accuracy.
Most of the resulting magnitudes had errors comparable to those in Pan-STARRS1 and 2MASS catalogues. The accuracies were sufficient to analyse the spectral energy distributions of the targets and identify different types of cataclysmic variables. Some issues were encountered, mostly caused by bad image quality or very dim targets. In few cases the astrometric calibration of the coordinates of the objects failed. In general the program is reliable and easy to use.
This master’s thesis describes the technical details of the pipeline and how it was used to study cataclysmic variables. Over 350 images of cataclysmic variables in multiple filters taken with the Nordic Optical Telescope were processed with the program to evaluate its performance and accuracy.
Most of the resulting magnitudes had errors comparable to those in Pan-STARRS1 and 2MASS catalogues. The accuracies were sufficient to analyse the spectral energy distributions of the targets and identify different types of cataclysmic variables. Some issues were encountered, mostly caused by bad image quality or very dim targets. In few cases the astrometric calibration of the coordinates of the objects failed. In general the program is reliable and easy to use.
Kokoelmat
- Avoin saatavuus [31941]