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We describe statistical properties of complete samples of HII regions in the grand-design spiral galaxies NGC 157, NGC 3631, NGC 6764 and NGC 6951. We use the catalogues of HII regions obtained from high-quality Hα line images by Rozas et al. . Slopes and zero points of diameter distribution functions for these four galaxies coincide well with

SU Ursae Majoris the prototype of a subgroup of dwarf novae that display superhumps in super- outbursts has been observed during an international campaign dedicated to the observation of the first day of outburst of dwarf novae during 1986 February. After the start of a brightening was reported, the star was monitored by IUE, ground-based

We present 2 weeks of CCD photometry of V404 Cyg, the optical counterpart of the soft X-ray transient (SXT) GS 2023+338, taken from La Palma in 1992 July. The R-band light curve shows a clear 0.3-mag ellipsoidal modulation on the estabished 6.5-d orbital period, but with substantial (up to 0.3 mag) superposed variations that occur during each night

The current status of the IUE project is described.

The solar core is the region where all the nuclear reactions take place and, therefore, where the energy is generated. Understanding the physics of these internal layers, the theory of solar and stellar structure can be settled into form grounds. However this is the most unknown region of the Sun. Helioseismology, mainly through the gravity modes