A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature...

Presentamos el estudio de lo que interpretamos como una posible hierofanía en la Cueva de la Lobera, en el santuario ibérico de Castellar (Jaén). El fenómeno...

The mid-infrared range contains many spectral features associated with large molecules and dust grains such as polycyclic aromatic hydrocarbons and silicates...

We derive inequalities which restrict the precision of the Stokes parameters imposed by photon noise. The signal-to-noise ratio of the measured Stokes...

Aims: The purpose of this work is to better understand the confidence limits of the photospheric solar oxygen abundance derived from three-dimensional models...

Context. Blob detection is a common problem in astronomy. One example is in stellar population modelling, where the distribution of stellar ages and...

Several recent studies have shown that the Vela OB2 region hosts a complex constellation of sub-populations with ages in the range 10 to 50 Myr. Such...

We examine the spatial clustering of blue horizontal branch (BHB) stars from the u-band of the Canada-France Imaging Survey (CFIS, a component of the...

Knowledge of the ages of the stars formed over a galaxy's lifetime is fundamental to an understanding of its formation and evolution. However, stellar ages are...