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Photometry

Marco Montalto
CAUP

This course will be dedicated to the photometric technique. We will review methods and instrumentation used to perform photometry and discuss some of the most widely used photometric systems. We will see how to pass from a raw image just taken at the telescope to a fully science calibrated image. We will also discuss absolute and differential photometry, see how color-magnitude and color-color diagrams are constructed as well as how lightcurves are derived. The course will include some practical lessons.

The slides from this course can be found here.

Sessão 1: First theoretical lesson
22 maio 2014

Place: Auditorium

Introductory remarks and basic concepts and definitions. Photometry in the past and today, and across different wavelength domains. Anatomy of a photometer and definition of photometric systems. Data acquisition and pre-reduction of the observations. Tips for the observers.

Sessão 2: First practical lesson
23 maio 2014

Place: Classroom

NB: limited attendance

Following the concepts introduced in the first lesson, we will start analyzing a photometric dataset using common practices and techniques.

Sessão 3: Second theoretical lesson
29 maio 2014

Place: Auditorium

Overview of typical reduction steps. Aperture, PSF and image subtraction techniques. Absolute vs. differential photometry. Post-reduction, detrending and calibration to an absolute reference system. Construction of color-magnitude and color-color diagrams and derivation of lightcurves.
Conclusive remarks.

Sessão 4: Second practical lesson
30 maio 2014

Place: Classroom

NB: limited attendance

We will continue the reduction of the dataset performing the extraction of the photometric information and cross-matching sources in different catalogs.

Sessão 5: Third practical lesson
12 junho 2014

Place: Classroom

NB: limited attendance

We will complete the reduction and calibrate projecting the data in a common photometric system. We will interpret the result using theoretical models.