How the stellar mass of early-type galaxies is assembled remains an open question. Are the stars formed in situ, possibly triggered by merger events, or do they...
The Roque de los Muchachos Observatory campaign in support of Deep Impact Mission
The Deep Impact mission was designed to have much of the mission-critial science done from Earth-based telescopes An unprecedent worldwide coordinated campaign...
The authors present the first results on the optical identification of 89 ROSAT sources on the second Lockman hole. Because of the low Galactic H I column...
The Rotation of Comet 1995 O1 (Hale-Bopp) at Perihelion
Narrow band near infrared images of comet 1995 O1 (Hale-Bopp), where obtained in day-time, during April 1997, using the 1.52m Carlos Sanchez Telescope, at Teide...
The Rotation of the Solar Core: Compatibility of the Different Data Sets Available
A combination of inverse and forward analysis techniques has been applied to p-modes rotational splittings in order to infer the solar rotation rate in the...
The rotation rate and its evolution derived from improved mode fitting and inversion methodology
We present inferences of the internal solar rotation rate and its evolution during solar cycle 23. A full solar cycle of MDI observations have been analyzed...
The Rotation Speed of the Companion Star in Aquila X-1
We have obtained medium resolution spectra of the neutron star X-ray transient Aql X-1 during quiescence. We determine the spectral type of the companion star...
The Round Table Discussion: How Should We Take Best Advantage of the New Generation of Large Telescopes for Cometary Research?
The highlights of the round table discussion held to discuss the most important pending problems in cometary astrophysics are reported. A number of experts...
The RR Lyrae distance scale from near-infrared photometry: current results .
We present new observational results on the RR Lyrae K-band Period-Luminosity relation (PLK). Data on the Galactic globular clusters NGC 3201 and NGC 4590 (M68)...