Deep CCD photometry for the dwarf galaxy in Tucana is presented. Distance modulus and metallicity are derived, together with an estimate of the age of the galaxy.

Charge transfer loss due to deep level traps in CCDs is a common phenomenon. In single-photon counting CCDs for X-ray detection, the charge loss results in a degradation of spectroscopic resolution. The transfer loss of a signal depends on various parameters like temperature, number of transferred charges, number of charges in the preceding signals and the elapsed time between these signals. Ea...

In this paper, the problem of ambiguities inherent in the manifold of any linear array structure is investigated. Ambiguities, which can be classified into trivial and nontrivial, depending on the ease of their identification, arise when an array cannot distinguish between two different sets of directional sources. Initially, the new concept of an ambiguous generator set is introduced; it repre...

A general communication device is a device that at every stage of the game receives a private message from each player, and in return sends a private signal to each player; the signals the device sends depend on past play, past signals it sent, and past messages it received. An autonomous correlation device is a general communication device where signals depend only on past signals the device s...

We present broadband V,I CCD photometry for ∼ 1700 stars towards the Galactic globular cluster Palomar 12, covering a field of 10.′7 × 10.′7. From these data, a colormagnitude diagram from the red giant branch tip to ∼ 2 mag below the cluster’s turn-off is obtained. From a comparison with the color magnitude diagrams of 47 Tuc and M5, and using different theoretical models, we confirm that Pal ...

We determine the luminosity function (LF) of galaxies in the core of the Coma cluster for MR ≤ −11.4 (assuming H0 = 75 km s Mpc), a magnitude regime previously explored only in the Local Group. Objects are counted in a deep CCD image of Coma having RMS noise of 27.7 R mag arcsec. A correction for objects in the foreground or background of the Coma cluster—and the uncertainty in this correction—...

In this paper we present the results of our participation to the Trecvid tasks Copy Detection and Multimedia Event Detection. It focus, in particular, on the comparison of systems for the CCD task, by analyzing the importance of 1) the audio module, 2) the video module and of 3) the fusion module.