Issue |
Astron. Astrophys. Suppl. Ser.
Volume 124, Number 1, July 1997
|
|
---|---|---|
Page(s) | 129 - 141 | |
DOI | https://doi.org/10.1051/aas:1997183 | |
Published online | 15 July 1997 |
Analysis of seven face-on spiral galaxies*
1
now at: Università di Trieste, Dip. di Astronomia, S.I.S.S.A.e Via Beirut 2-4 34013 Trieste, Italy
2
Istituto di Astrofisica Spaziale C.N.R.-I.A.S. Via Enrico Fermi 23, 00044 Frascati (RM), Italy
Received:
16
July
1996
Accepted:
16
November
1996
We continue in this work the study of nearby spiral galaxies
started with NGC 628 (Natali 1992, hereafter Paper I).
A sample of seven face-on spiral galaxies has been selected to obtain
images in the U, B, V, R, I bands using a CCD detector at the 90 cm Schmidt
telescope at Campo Imperatore Observatory.
Surface photometry using a dedicated software is used to derive both the
surface brightness radial profiles in each band and the colour indexes.
The radial disk scalelengths obtained from the radial profiles
show a trend with wavelength which seems to highlight a huge presence of
dust in the inner disk zone.
For two galaxies of the sample the presence of
dust is confirmed by the radial trend of colour indexes. The presence
of galactic infall already detected for NGC 628, is confirmed, from the
bluish , also for NGC 3184.
Key words: galaxies, spiral / photometry
© European Southern Observatory (ESO), 1997