We show that grazing-incidence telescopes, like those used for X-ray imaging, present negligible instrumental polarization. This property does not depend on the number of reflections the telescope employs to lead light from the entrance pupil to the focal plane. The result applies to the various mirrors of the advanced X-ray astrophysics facility

We present low-resolution spectra obtained from 5 to 11 months after the discovery of the Type II supernova 1990E in NGC 1035. We analyse the evolution of the Hα feature and discuss the late-time luminosity- powering source through the evolution of the Hα flux. Whatever the SN 1990E photometric subclass, the shape of the Hα profile in these spectra

The Astrophysics Institute of the Canaries (IAC) studies the Galaxy's hidden centre from the Teide Observatory, Tenerife.

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A precise measurement of the l = 1 rotational splitting has been derived from the 1991 IRIS data and it leads to a moderate rotation rate in the solar core.