Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...91...61v&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 91, no. 1, Nov. 1991, p. 61-128.
Astronomy and Astrophysics
Astronomy
26
Galactic Structure, Infrared Astronomy Satellite, Star Formation Rate, Visual Observation, Active Galactic Nuclei, Astronomical Catalogs, Charge Coupled Devices, Luminosity, Sky Surveys (Astronomy), Southern Sky
Scientific paper
Optical observations are presented and spectra, broadband, color and continuum-subtracted H-alpha CCD images are shown for more than 50 galaxies in order to study the processes that enhance the star formation rate in some galaxies. The spectra are mostly HII-types, although some 25 percent are AGN-types. The broadband images show, among other things, that this sample predominantly consists of of barred signals and distorted interacting systems, while the H-alpha images show in most cases small compact sources. Redshifts, line-ratios, equivalent widths, and extinction determinations from the H-beta/H-alpha line ratios are derived from the spectra. Integrated magnitudes, colors, H-alpha fluxes, diameters, and luminosities of the galaxies from the CCD images are also derived. Average luminosity profiles of all early-type galaxies and possible merger candidates in this sample are determined, and it is found that all these galaxies have exponential disks except two objects that follow a de Vaucouleurs r exp 1/4 law: a merger candidate and an elliptical galaxy in a close interacting pair.
de Grijp Marinus H. K.
de Jong Teije
Driel Wim van
Goudfrooij Paul
Lub Jan
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