ar X iv : a st ro - p h / 98 03 15 5 v 1 1 3 M ar 1 99 8 Deep ISOCAM Observations of Abell 2218

ar X iv : a st ro - p h / 98 03 02 5 v 1 3 M ar 1 99 8 RXTE / ASM OBSERVATIONS OF PSR B 1259 − 63

RXTE/ASM observations of PSR B1259−63 near the 1997 periastron passage find no emission brighter than ∼10 times that detected by ASCA during the 1994 periastron encounter, demonstrating that the pulsar is unlikely to have undergone even brief episodes of accretion.

ar X iv : a st ro - p h / 98 03 21 2 v 1 1 8 M ar 1 99 8 Anisotropy of CMB & Cosmological Model

In this brief review I will touch upon the main points and trends of observational and theoretical cosmology, that influence and change today our understanding of the Universe.

ar X iv : a st ro - p h / 98 03 03 9 v 1 4 M ar 1 99 8 Cosmology With High - Redshift Water Masers

Multi-epoch VLBA observations of the maser in NGC 4258 have yielded a 4% geometrical distance to the galaxy. The potential scientific payoffs of finding similar objects at large distances, in the Hubble flow, are considerable. In this contribution, I discuss the plausibility of detecting high-redshift water masers, and describe a search strategy that we have implemented to realize this objective.

ar X iv : a st ro - p h / 95 03 12 5 v 1 3 A pr 1 99 5 COURSE 1 COSMOLOGICAL DYNAMICS

ar X iv : a st ro - p h / 98 05 21 3 v 1 1 5 M ay 1 99 8 Light element abundances in He - rich stars

We present an abundance analysis of light elements in He-rich stars. The analysis is based on both low and high resolution observations collected at ESO, La Silla, Chile in the optical region and includes 6 standards and 21 He-rich stars. Light-element abundances display a diverse pattern: they range from under-solar up to above-solar values.