Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191...29j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 1, Feb. 1988, p. 29-38.
Astronomy and Astrophysics
Astrophysics
9
Astronomical Photography, Astronomical Photometry, Elliptical Galaxies, Emission Spectra, Interacting Galaxies, Irregular Galaxies, Line Spectra, Starburst Galaxies, Galactic Nuclei, Hot Stars, Interstellar Gas, Ionized Gases, Photoionization, Radial Velocity, Ubv Spectra
Scientific paper
This paper presents the results of a photometric and spectroscopic multifrequency investigation of the system NGC 454, which is a pair of emission-line galaxies in close interaction (or in the early stage of a merger) consisting of a large elliptical and a blue irregular galaxy. The central regions of both components have colors that correspond to a mixture of two stellar populations, one old and the other with an age of less than 10 to the 7th yr and an upper mass limit of about 15 solar masses. In the elliptical component, the new stars contribute about 0.1 percent of the total stellar mass within the central 22 arcsec; in the irregular galaxy, the new stars contribute 10 percent of the stellar mass within 12 arcsec. South of the two main components, there are three blue objects that probably are parts of the irregular galaxy; two of these objects, consisting of stars with ages less than 10 to the 7th yr, exhibit strong thermal emmission lines. The third object (of about 5 x 10 to the 7th yr) does not show any gas emission.
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