A recent paper by King & Ritter (KR) proposed that the light curves of Soft X-ray Transients (SXTs) are dominated by the effect of irradiation of the accretion disc by the central X-rays. This prevents the onset of the cooling wave which would otherwise return the disc to the quiescent state, and so prolongs the outbursts beyond those in dwarf nova

Long slit spectrophotometry of 13 bipolar planetary nebulae has been used to study their physical and chemical properties. In each nebula, one to seven different spatial regions have been considered in order to search for possible abundance variations through the nebulae. We obtained the following main results: - within the errors, the He, O, and N

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The best studied gravitational lens is the Twin QSO Q0957+561, and as a result of recent advances in observations and modelling, a ten percent measurement of the Hubble constant is attainable. We discuss in detail this system and review the perspectives in a near future.

The tables list positions, sizes and photometry in V and R band of extended objects found in fields, which include a nearby interacting galaxy. The tables' filenames are a combination of the table number and the interacting galaxy's name. The column-descriptions of all tables are identical, expect that the positional offsets refer to different

IAUC 6816 available at Central Bureau for Astronomical Telegrams.