Last two years the GTC control system has continued its design and prototyping activity. This paper presents the current state of the GTC control system architecture. The overall architecture is already designed and the main subsystems have been specified and are being designed. Design patterns have been applied to the architecture design and are

This paper is focused on how the features and object services provided by CORBA (Common Object Request Broker Architecture) can be applied to solve the specific needs of a modern telescope control system. The solutions presented in this paper are based on TAO, which is the ORB (Object Request Broker) implementation selected by the GTC Control Group

For the eclipsing binary system CM Draconis, eclipse minimum times have been monitored with high precision between 1994 and 1999. Periodic deviations of minimum times from a linear ephemeris may indicate the presence of an orbiting third body. Individual measurements of 41 eclipse minimum times result in a standard deviation from linear ephemeris

In this work, we have linked our evolutionary synthesis models, covering the entire spectral range from radio to X-rays, with photoioniztion codes in order to investigate the effects of the X-ray emission from starburst galaxies on the optical emission lines.

IAUC 7423 available at Central Bureau for Astronomical Telegrams.

IAUC 7429 available at Central Bureau for Astronomical Telegrams.