Spectroscopy of H II Regions in the Late-Type Spiral Galaxy NGC 6946

TL;DR

This study conducts spectroscopic analysis of 39 H II regions in NGC 6946, determining their chemical abundances and radial gradients to understand the galaxy's chemical composition distribution.

Contribution

First detailed spectroscopic survey of multiple H II regions in NGC 6946 using the BTA telescope, providing new data on chemical abundances and gradients.

Findings

Determined oxygen and nitrogen abundances for 30 H II regions.

Constructed radial abundance gradients of O/H and N/H.

Provided absorption estimates for all 39 regions.

Abstract

We present the results of spectroscopy of 39 H II regions in the spiral galaxy NGC 6946. The spectral observations were carried out at the 6-m BTA telescope of the SAO RAS with the SCORPIO focal reducer in the multi-slit mode with the dispersion of 2.1A/px and spectral resolution of 10A. The absorption estimates for 39 H II regions were obtained. Using the "strong line" method (NS-calibration) we determined the electron temperature, and the abundances of oxygen and nitrogen for 30 H II regions. The radial gradients of O/H and N/H were constructed.