Photometric observations of 1620 Geographos in 1993 and 1994 are presented and, in combination with previously published data, are used to derive models of Geographos. We estimate that the sidereal period of rotation is 0.21763860 +/- 0.00000003 days (5^h13^m23.975^s +/- 0.003^s). The sense of rotation is retrograde. The ecliptic coordinates of the

This is the first paper of a series aimed at studying the structural and photometric properties in the optical band of a sample of 95 radio galaxies. Detailed surface photometry in the B and R bands is reported here for 29 objects. We give contour plots and complete structural (ellipticity, position angle, Fourier coefficients) and photometric

During our recent observing run at La Silla (April 26-28, 1996), we had the chance to experiment successfully a previously unexplored capability of the NTT: high-dispersion spectroscopy using the full slit length of EMMI.

We present kinematical evidence that the irregular galaxy located 26'' northwest of IZw18 -the most metal-poor blue-compact-dwarf (BCD) galaxy known- is a dynamically associated companion system. Longslit CCD spectra were obtained in 1996 February using the 4.2m WHT+ISIS at La Palma, with the slit placed across the NW HII region of IZw18 and

This paper presents new near infrared observations of 160 Irregular variables of type Lb in the JHKL'M filter bands. These measurements are supplemented by data for additional 56 stars taken from the literature. In total 220 datasets are available because of some multiple observations. From our sample, 216 stars have near infrared (NIR) photometry

The [Fe II] and [Fe III] emission of seven galactic H II regions is studied with the aim of comparing their gaseous Fe abundance. The [Fe II] line intensity ratios are found to behave in a manner that suggests fluorescence effects. In addition, the uncertainty in the physical conditions and the ionization stratification of the layers where [Fe II]