New UBV parameters for 46 E-SO galaxies in the Virgo cluster

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Electrophotometry, Ubv Spectra, Virgo Galactic Cluster, Color, Magnitude, Spectrum Analysis

Scientific paper

Multi-aperture UBV photometry of 46 Virgo cluster E-SO galaxies has been obtained. This material has been checked and completed with other photoelectric data in the literature, to provide a hopefully improved set of the parameters defined in the Second Reference Catalogue of Bright Galaxies, i.e. asymptotic magnitude BT, effective aperture diameter Ae, and colors within Ae. Interpolated UBV parameters at the standard aperture of 1' are also given, to provide calibration of surface photometry.
Various known correlations are rediscussed with this material. It appears that the color-magnitude diagram (U-V)e - VT of E-SO galaxies in Virgo is curved. This effect is dependent of the choice of the parameters and would be lessened, but not suppressed, by defining the color and magnitude parameters in the same way as Visvanathan and Sandage (1977). After correction for the magnitude effect, SO galaxies appear marginally redder and SBO significantly redder than ellipticals.

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