Secular evolution gradually shapes galaxies by internal processes,in contrast to early cosmological evolution which is more rapid. Animportant driver of secular evolution is the flow of gas from the disk into the central regions, often under the influence of a bar. In this chapter we review several new observational results on barsand nuclear rings

Recent observations from the Sunrise balloon-borne solar telescope have enabled us to reach an unprecedented high spatial resolution on the solar surface with the near-ultraviolet photo-spheric and chromospheric images as well as the magnetograms. We use these high resolution observations to investigate the structure of the solar upper photosphere

Not Available

We present a detailed analysis of the radial distribution of dust properties (extinction, PAH abundance and dust-to-gas ratio) in 57 galaxies in the SINGS sample, performed on a multi-wavelength set of UV, IR and radio surface brightness profiles, combined with published molecular gas profiles and metallicity gradients.

We describe the OTELO survey and present deep BVRI imaging data of the Groth field. Galaxy number counts and galaxy clustering are analyzed. We find an excellent agreement between observed and mock data number counts. We also find a evidences about a galaxy clustering evolution and a strong dependence of the angular correlation function with the

We calculated new estimates of the Delta VHBbump parameter for 15 Galactic Globular Clusters (GGCs) using accurate ground-based photometric data. We enlarged our sample with literature data and we obtained a sample of 62 GGCs covering a wide metallicity range (-2.16le [M/H]le -0.58 dex). To compare the data with the theory we used theoretical