During the years 1996 through 1998 the Michelson Doppler Imager (MDI) and the Global Oscillations at Low Frequency (GOLF) experiments on the Solar and Heliospheric Observatory (SOHO) mission have provided unique and nearly uninterrupted sequences of helioseismic observations. This paper describes the analysis carried out on power spectra from 759

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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