Visible and Infrared Spectroscopy of the Planetary Nebula M4-18

Abstract 0.47–2.45 μm spectroscopy is reported for the compact planetary nebula Minkowski 4-18 (PK146+07), filling some spectral gaps and presenting uniform and simultaneous observation of this entire spectral range. While the strongest features are the H i lines, the most prevalent are those of carbon, principally of C ii, commensurate with the carbon rich, Wolf–Rayet nature of the exciting star.