The paper presents isophotal maps of the distribution of the flux emitted by transitions of various molecular species in the spectrum of Comet Halley at a heliocentric distance of 1.92 AU, after perihelion. The observations were made at the Observatorio del Roque de los Muchachos, in La Palma, using the RGO Image Photon Counting System attached to

New optical and infrared spectroscopic and photometric observations of the cometary nebula 1548C27 have shown that a young star loosing mass at high velocity (hundreds of km 1) is the source of energy of the nebula. This source is suggested from its infrared luminosity, to be a Herbig Ae-Be type star surrounded by a dusty envelope radiating at a

New bidimensional spectroscopic observations of A78 allow the authors to determine the He, O, Ne, and N abundances and their variations along the nebula. A clear overabundance of these elements is found in the central region of the nebula, suggesting different nebular ejections of material processed in the stellar interior and dredged-up

Detailed spectrophotometry in the visual and near-infrared is presented for four different slit positions over the core of NGC 604. The excitation ([O II]/[O III]) varies considerably both along the slit and between different slit positions, but the line ratios ([O II]+[O III])/Hβ, [N II]/[O II], [N II]/[S II] and ([O II]/Hβ)×([O II]/[S II]) are

The authors present optical and near infrared photometry, covering from 0.36 to 2.3 microns, for a wide sample of red giant stars in the globular cluster M3. These measurements are used to make a first attempt in order to apply the Infrared Flux Method to obtain the observational (L - Teff) diagram for cluster stars. The peculiarities of the method

Extensive high sensitivity observations of the cosmic microwave background have been made on an angular scale of 8° covering a substantial fraction of the northern sky. An observed anisotropy in the sky emission at a level of ΔT/T = 3.7×10-5 has been detected (T is temperature). This level should strictly be interpreted as an upper limit to the