Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...49..591m&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 49, Aug. 1982, p. 591-606.
Astronomy and Astrophysics
Astrophysics
23
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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