Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1762o&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1762-1778, 2011.
Astronomy and Astrophysics
Astronomy
69
Astronomical Photometry, Color-Magnitude Diagram, Distribution Functions, Globular Clusters, Metallicity, Charge Coupled Devices, Elliptical Galaxies, Pixels
Scientific paper
Four fields in the elliptical galaxy NGC 1399 in the Fornax cluster have been examined by Washington CCD photometry. The application of color-magnitude diagrams and color-color diagrams discloses a large population of globular clusters, as well as a field population that becomes increasingly important at larger radii and fainter than T(1) of about 21.5. A small gradient in the mean color with radius translates into a metallicity difference of approximately 0.2 dex over a radial extent of approximately 3 arcmin. The metallicity distribution function of the NGC 1399 is investigated in order to derive the Fe abundances on the Zinn scale. The abundances are precise to approximately 0.25 dex and accurate to approximately 0.3 dex. A nuclear abundance for NGC 1399 of +0.14 +/- 0.2 is also determined.
Forte Juan C.
Geisler Doug
Ostrov Pablo
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