Oxygen and nitrogen abundances of HII regions in six spiral galaxies

Abstract

Spectroscopic observations of 63 HII regions in six spiral galaxies (NGC 628, NGC 783, NGC 2336, NGC 6217, NGC 7331, and NGC 7678) were carried out with the 6-meter telescope (BTA) of Russian Special Astrophysical Observatory with the Spectral Camera attached to the focal reducer SCORPIO in the multislit mode with a dispersion of 2.1A/pixel and a spectral resolution of 10A. These observations were used to estimate the oxygen and nitrogen abundances and the electron temperatures in HII regions through the recent variant of the strong line method (NS calibration). The parameters of the radial distribution (the extrapolated central intercept value and the gradient) of the oxygen and nitrogen abundances in the disks of spiral galaxies NGC 628, NGC 783, NGC 2336, NGC 7331, and NGC 7678 have been determined. The abundances in the NGC 783, NGC 2336, NGC 6217, and NGC 7678 are measured for the first time. Galaxies from our sample follow well the general trend in the luminosity - central metallicity diagram for spiral and irregular galaxies.

11 pages, 7 figures, 6 tables. Accepted for publication in MNRAS

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• Spectroscopy of H II Regions in the Late-Type Spiral Galaxy NGC 6946
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• Unveiling the 100 pc scale nuclear radio structure of NGC 6217 with e-MERLIN and the VLA
• Peculiarities of the chemical abundance distribution in galaxies NGC 3963 and NGC 7292
• Physical parameters of stellar population in star formation regions of galaxies
• Star formation rates and the kinematics of gas in the spiral arms of NGC 628
• Young Stellar Complexes in the Giant Galaxy UGC 11973
• Decoding the Gravitational Geometry and Stellar Photometric Profiles of Galaxy NGC 7331