Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131....1s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 1, Feb. 1984, p. 1-8. Research supported by the Consiglio Nazionale d
Astronomy and Astrophysics
Astrophysics
25
Abundance, Astronomical Spectroscopy, Galactic Structure, Interstellar Gas, Ionized Gases, Radial Velocity, Hydrogen Clouds, Line Spectra, Neutral Gases, Nitrogen, Oxygen
Scientific paper
Spectroscopic observations of NGC 4449 obtained at 600-700 nm and mean dispersion 11.0 A/mm with an echelle spectrograph and at 440-720 nm and 120 A/mm with a B&C spectrograph at the Cassegrain focus of the 182-cm reflector, and at 400-750 nm and 125 A/mm with a nebular spectrograph at the Newtonian focus of the 122-cm reflector, all at Asiago Observatory, are reported. The data and calculated line ratios are presented in tables, graphs, and radial-velocity-field diagrams and compared with published observational data on other objects. The internal ionized gas is found to have a velocity gradient opposite to that of the external neutral gas. The observed ratios of the forbidden O III and N II lines to H-beta and H-alpha, respectively, are used to determine the O and N abundances: 12 + log(O/H) = 8.3 and 12 + log(N/H) = 7.1. The filamentary structure of NGC 4449 is discussed and illustrated in an appendix.
Bianchini Antonio
Ortolani Sergio
Sabbadin Franco
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