Bibcode
del Río, M. S.; Cepa, J.
Referencia bibliográfica
Astronomy and Astrophysics, v.400, p.421-428 (2003)
Fecha de publicación:
3
2003
Revista
Número de citas
1
Número de citas referidas
1
Descripción
We present here the results of an imaging study of eight grand-design
and two intermediate-arm galaxies, based on CCD observations in U, B, V,
R and I. We give grey-scale images, both in individual and in colour
indices. Also we present a decomposition into bulge and disc following
an iterative method. This provides us with a reasonable estimate of the
bulge size and disc scale length, and shows the disc deviation from an
exponential law, which can be interpreted as due to the long-term star
formation caused by the spiral arms. To evaluate the contribution of the
spiral arms to the disc luminosity distribution, with the aid of a mask
we have decomposed each image into two parts: arms (which include bulge
and nucleus, and eventually bars) and inter-arms (which include the
outer disc).
In subsequent papers in this series (del Río & Cepa
cite{del1998}, hereafter Paper III; del Río & Cepa
cite{del1999}, hereafter Paper IV) the data presented here are used to
analyse the spiral structure of the galaxies of the sample, using the
methods of Beckman & Cepa (cite{Beckman}, hereafter Paper I) and
the Fourier transform method to find the different symmetry degrees.
Figures 1 to 4 and Fig. 7 are only available in electronic form at
http://www.edpsciences.org}