An attempt is made to confirm the observation of Allen (1980) of a 3.3-micron emission feature attributed to thermal dust emission in the quasar 3C 273...

Thirty Seyfert galaxies have been studied for bright sources. The photometry is reported and three of the more unusual galaxies (Mrk 705, Mrk 817, and Mrk 1095)...

Maps of a 3 by 2 arcmin region of the inner coma of comet Halley, at 10 arcsec resolution, in several principal atomic and molecular species were prepared by...

Results are presented of an imaging study of eight Sb-Sc spirals, based on CCD observations in the B, V, R, I, and Z photometric filters. Presented are grey...

The radiation-induced polymerization of indene with a γ radiation source was studied at different dose rates (1, 2, 4, 6 kGy/h) and absorbed doses up to 400 kGy...

The solar p-mode spectrum of very low l is measured with high accuracy for a long enough period of time so as to allow the search for solar cycle variations. In...

The 2.5-m Isaac Newton telescope has been used in a spectrophotometric monitoring program of high-luminosity AGN. The data acquisition and analysis techniques...

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The observations were made on 2003 March 30 with the UVES, at the VLT Kueyen Telescope in Cerro Paranal Observatory (Chile). We used the standard settings in...