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Astron. Astrophys. 352, L5-L10 (1999)

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Letter to the Editor

Morphological structure and colors of NGC 1232 and NGC 1288 *

C. Möllenhoff 1, I. Appenzeller 1, W. Gässler 3, R. Häfner 3, J. Heidt 1, W. Hummel 3, B. Muschielok 3, H. Nicklas 2, G. Rupprecht 4, W. Seifert 1, O. Stahl 1 and T. Szeifert 1,5

1 Landessternwarte, Königstuhl 12, 69117 Heidelberg, Germany (cmoellen@lsw.uni-heidelberg.de)
2 Universitäts-Sternwarte, Geismarlandstrasse 11, 37083 Göttingen, Germany
3 Universitäts-Sternwarte, Scheinerstrasse 1, 81679 München, Germany
4 ESO, Karl Schwarzschild Strasse 2, 85745 Garching, Germany
5 ESO, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago 19, Chile

Received 9 August 1999 / Accepted 23 August 1999


Using the FORS1 focal reducer camera at the VLT UT1 (Antu) a multi-color surface photometry has been carried out for the southern Sc galaxies NGC 1232 and NGC 1288. Two-dimensional functions for the disk and the bulge were fitted to the surface-brightness distribution, yielding a high-precision disk-bulge decomposition. Nearly linear correlations for the characteristic scale parameters of disk and bulge in the different colors were found, as well as similar correlations for the central surface brightness of the disk and the effective surface brightness of the bulge. This seems to indicate that there exist connections between disk and bulge properties in spiral galaxies and their stellar density and population distributions.

Key words: galaxies: individual: NGC 1232; NGC 1288 – galaxies: fundamental parameters – galaxies: photometry – galaxies: spiral – galaxies: structure

* Based on observations collected at the European Southern Observatory, Paranal, Chile (VLT UT1 Commissioning Program).

Send offprint requests to: C. Möllenhoff

© European Southern Observatory (ESO) 1999

Online publication: November 23, 1999