AGA0414 - Métodos Observacionais em Astrofísica I (2020)

fits files

In this lecture, with the help of ds9 , we will inspect our first fits file to understand how it works and how we can get the most out of it.

Note that there is a fits file in the folder; we will use this as an example.

Data reduction

In this class, I explain in quite some detail how to reduce an image (bias and flat).

I follow the steps in IRAF which are very didactic.

I use a subset of the data which are available here: https://drive.google.com/drive/folders/185RkFcEC5JfDWRfwouU8yWPKjT5Q9-VH?usp=sharing

CCD Characterisation

In this class, we explain how to get the main characteristics of a CCD (readout noise, gain and linearity).

Photometry

In this class (which is split in two) we discuss photometry.

In the first class, we introduce photometry in a general sense and, more in detail, aperture photometry. We also generally introduce psf-photometry and we present SExtractor. We also duscuss absolute photometry as opposed to differential photometry.

In the second class, we deepen in the concept of magnitude (both Vega and AB) and the need for calibration.