Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256...79n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 79-85.
Astronomy and Astrophysics
Astrophysics
25
Astronomical Photometry, Galactic Structure, Spiral Galaxies, Ubv Spectra, Charge Coupled Devices, Color-Color Diagram
Scientific paper
We present results on the surface photometry of the spiral galaxy NGC 628, obtained using the Istituto di Astrofisica Spaziale CCD camera at the 60/90/180 cm Schmidt telescope of the Osservatorio Astronomico di Roma at Campo Imperatore. The large field of view of that unusual combination allows us to collect single frame images of (25 x 17) sq arcmin of this large angular diameter object. The analysis of the UBVRI profiles extracted by a dedicated software using a median algorithm shows a variation in disk scale length vs. wavelength, and a radial B-V trend consistent with the Larson & Tinsley (1978) model. The study highlights two main regions in this galaxy: the inner disk and the outer disk, dominated by two different stellar populations. Moreover, correlating the U-B, B-V diagram of circular subsets of the galaxy to the Larson & Tinsley model, we derive an estimation of the star formation rate in different radial parts of this object.
Natali Giuliano
Pedichini Fernando
Righini M.
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