Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..543b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 2, p. 543-557
Astronomy and Astrophysics
Astronomy
96
Color-Color Diagram, Colorimetry, Galaxies, Photoelectricity, Star Formation, Astronomical Catalogs, Astronomical Models, Astronomical Photometry, Laplace Transformation, Ubv Spectra
Scientific paper
Total color indices (V-R)T, (V-I)T and effective color indices (V-R)e, (V-I)e in the Cousins VRI photometric system are presented for 501 mostly normal galaxies. The colors are computed using a procedure outlined in the Third Reference Catalogue of Bright Galaxies (RC3) whereby standard color curves approximated by Laplace-Gauss integrals are fitted to observed photoelectric multiaperture photometry. 11 sources of such photometry were used for our analysis, each source being assigned an appropriate weight according to a rigorous analysis of residuals of the data from the best-fitting standard color curves. Together with the integrated B-V and U-B colors provided in RC3, our analysis widens the range of wavelength of homogeneously defined colors of normal galaxies of all Hubble types. We present color-color and color-type relations that can be modeled to understand the star formation history of galaxies.
Buta Ron
Williams Kesha L.
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