The focus of the present paper is on the detailed description of the internal structures of low mass, population II stars, to clarify some issues about these...

We present optical observations of a sample of 57 spiral galaxies and describe the procedures followed to reduce the data. We have obtained images in the...

From Hα images of a carefully selected sample of 57 relatively large, Northern spiral galaxies with low inclination, we study the distribution of the Hα...

The discovery of structure in the 5 minute oscillations of the sun, integrated over the full disk, was reported by Claverie et al. (1979). This paper presents...

Context. Abell 1995 is a puzzling galaxy cluster hosting a powerful radio halo, but it has not yet been recognized as a obvious cluster merger, as usually...

Context. Light bridges (LBs) are elongated structures with enhanced intensity embedded in sunspot umbra and pores. Aims: We studied the properties of a sample...

Context. The structure of outer disc of our Galaxy is still not well described, and many features need to be better understood. The second Gaia data release...

Aims: An in depth analysis of the images acquired in broad-band optical and infrared observations in the R, I, and J, H, Ks bands of comet C/199T1 (McNaught...

Context. The results obtained by asteroseismology with data from space missions such as CoRoT and Kepler are providing new insights into stellar evolution...