A&A 415, 63-76 (2004)
Disk-bulge decompositions of spiral galaxies in UBVRIC. Möllenhoff
Landessternwarte, Königstuhl 12, 69117 Heidelberg, Germany
(Received 28 July 2003 / Accepted 20 October 2003)
A sample of 26 bright spiral galaxies ( ) with low to medium inclination and without a bar was observed with UBVRI filters. The CAFOS focal reducer camera at the Calar Alto 2.2 m telescope was used. The surface-brightness distributions were fitted using a 2-dimensional algorithm with corresponding functions for the disk- and bulge-structure. For the disks an exponential function was used, for the bulges a Sérsic law, was applied with the concentration parameter as another fit variable. Correlations of the resulting structural parameters of disks and bulges in UBVRI are investigated, giving clues to the formation history of the bulges.
Key words: galaxies: spiral -- galaxies: structure -- galaxies: photometry -- galaxies: fundamental parameters -- galaxies: statistics -- galaxies: formation
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