We analyze the bremsstrahlung emission obtained by the α -γ coincidence measurements to investigate on the α -decay dynamics of the 214 Po nucleus. We performed the experiment using a radioactive 226 Ra source leading, by α -decays, to the 214 Po nucleus, and the apparatus with the Si detector for α -particles, the NaI(Tl) detector able to collect

We have used multiband high-resolution HST WFPC2 and ACS observations combined with wide-field ground-based observations to study the blue straggler star (BSS) population in the Galactic globular cluster NGC 6388. As in several other clusters we have studied, the BSS distribution is found to be bimodal: highly peaked in the cluster center, rapidly

In this work we present the results of an optical photometric study performed to seven nearby AGN that were selected with the SDSS-DR5 database. Surface photometric techniques have been applied to the data in order to obtain B/D ratio and therefore the M_R(Bulge) magnitudes. Bulge luminosities were then used to estimate the black-hole masse (M_{BH}

Context: In transverse coronal loop oscillations, two periodicities have been measured simultaneously and are interpreted as the fundamental kink mode (with period P_1) and the first harmonic (with period P_2). Deviations of the period ratio P1/2P2 from unity provide information about the extent of longitudinal structuring within the loop. Aims

We have performed the analysis of the X-ray XMM-Newton spectra of the narrow line Seyfert 1 galaxy UGC 11763 (Mkn 1513). We have studied the EPIC data in the range 0.35-10.0 keV (1.2-35.4 Å) and also the high resolution soft X-ray spectra taken with the Reflection Grating Spectrometers (RGSs) in the range 10-30 Å (0.41-1.2 keV). The principal

The origin of short-lived radioactive nuclei at the time of the formation of the Sun is a much debated mystery in modern astronomy. We show that abundance predictions for massive AGB stars (roughly 6 Msolar) of solar metallicity can self-consistently match the abundances of 26Al, 41Ca, 60Fe, and 107Pd in the early Solar System, as derived from