Vilnius CCD photometry of NGC 4755 and 47 Tuc

Abstract

Abstract. CCD observations of the southern clusters NGC 4755 and 47 Tucanae were obtained in the Vilnius photometric system. A brief outline of the data pathway from observations to final analysis via IRAF and ASCAR software is given.

Research Programs at the Carter Observatory: An Overview

“…The initial observing program was of bright stars (V < 7) from the South Celestial Pole to about declination -20° (Forbes, Dodd & Sullivan 1994). Routine observations of northern-hemisphere Vilnius standards are made to check the relationship between the two systems (Forbes, Dodd & Sullivan 1993).…”

“…A study using integrated Vilnius photoelectric photometry of LMC clusters and globular clusters in the Milky Way Galaxy was carried out using the 0 • 6 m Mt John Observatory telescope (Dodd & Zdanavicius 1996) and CCD camera observations, again in the Vilnius system, made of the clusters NGC4755 and 47Tuc (Dodd et al 1996).…”

Photometric determination of the [Fe/H] ratio for the globular cluster M 92

“…We had several aims in view: e.g., automated photometric classification of a wide variety of stars (Smriglio et al 1986(Smriglio et al , 1988(Smriglio et al , 1990, CCD photometry in the Vilnius photometric system (Boyle et al 1990a,b;Boyle et al 1994;Dodd et al 1996;Boyle et al 1998;Smriglio et al 1998;Smriglio et al 2002), determination of interstellar extinction (Smriglio et al 1991;Boyle et al 1992;Janulis & Smriglio 1992), and the study of the cloudy structure of interstellar dust and the gas-to-dust ratio Smriglio et al 1995;Smriglio et al 1996). The observations of globular clusters give the opportunity of calibrating photometric systems in terms of temperature, luminosity, and metallicity, since these parameters, and the interstellar reddening of the cluster stars can be measured with rather good accuracy.…”