J/AJ/109/543 Color of Bright Galaxies (Buta+ 1995)
Total and Effective Colors of 501 Galaxies in the Cousins VRI Photometric System
Buta R., Williams K.L.
<Astron. J. 109, 543 (1995)>
=1995AJ....109..543B 1995AJ....109..543B
ADC_Keywords: Galaxies, optical; Colors
Abstract:
Total color indices (V-R)tot, (V-I)tot and effective color indices
(V-R)eff, (V-I)eff 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 80 501 Total and effective V-R and V-I color indices
for 501 galaxies
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1-12 A12 --- Object Object name in various catalogues
15-17 I3 --- RC3 Numerical stage index in revised Hubble
system, from the RC3
18-20 I3 --- o_V-Rtot Number of observations of V-R
21-26 F6.2 mag V-Rtot []? Total V-R color index
27-33 F7.3 mag e_V-Rtot []? V-Rtot internal mean error
34-39 F6.2 mag V-Itot []? Total V-I color index
40-46 F7.3 mag e_V-Itot []? V-Itot internal mean error
47-52 F6.2 mag V-Reff []? Effective V-R color index
53-59 F7.3 mag e_V-Reff []? V-Reff internal mean error
60-65 F6.2 mag V-Ieff []? Effective V-I color index
66-72 F7.3 mag e_V-Ieff []? V-Ieff internal mean error
73-76 I4 --- TSSC_B-V *[]? Type index of B-V used to fit V-R
77-80 I4 --- TSSC_U-B *[]? Type index of U-B used to fit V-I
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Note on TSSC_B-V:
The type index of the B-V standard color curve used to fit V-R (see
Figure 6 of the Second Reference Catalogue of Bright Galaxies, RC2);
T(SCC)= 20 refers to a curve of zero integrated color gradient.
Note on TSSC_U-B:
The type index of the U-B standard color curve used to fit V-I (see
Figure 6 of RC2); T(SCC)= 20 refers to a curve of zero integrated
color gradient.
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Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 29-Apr-1995
(End) [CDS] 11-Jul-1995