ar X iv : a st ro - p h / 98 05 10 6 v 1 8 M ay 1 99 8 Probing Black - Hole Physics in the Laboratory Using High Intensity Femtosecond Lasers

ar X iv : a st ro - p h / 98 05 29 9 v 1 2 2 M ay 1 99 8 A Supermassive Black Hole or a Compact Object Without Events Horizon ?

Previously it was shown that gravitation theory allows the ex-istance of supermassive stable compact configurations of the degenerated electronic gas (L.V.Verozub, Astr. Nacr. 317 (1996) 107) without events horizon. In the present paper the simplest model of such kind of objects in gas environment has been considered. It is shown that at the spherically symmetric accretion onto the object the l...

ar X iv : a st ro - p h / 98 05 05 8 v 1 6 M ay 1 99 8 The effects of convection on the colours of A and F stars

We present a discussion on the effects of convection on the uvby colours of A and F stars. The mixing-length theory used in ATLAS9 is compared to the turbulent convection theory of Canuto & Mazzitelli (1991, 1992). Comparison with fundamental stars reveals that colours calculated using the Canuto & Mazzitelli convection theory are generally in better agreement than those obtained using mixing-l...

ar X iv : h ep - p h / 98 05 46 8 v 1 2 6 M ay 1 99 8 COURSE HEAVY QUARK PHYSICS

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.

ar X iv : a st ro - p h / 99 05 37 6 v 1 2 8 M ay 1 99 9 A 6 . 4 - hr positive superhump period in TV