The Hα observations of the California Nebula (NGC 1499) with DEFPOS

A dual étalon Fabry‐Pérot spectrometer called DEFPOS has been used for observing physical properties of HII regions and planetary nebulae since May 2007 (Aksaker et al. 2009, 2011; Şahan et al. 2009; Şahan 2011). In this study, the Hα measurements of the HII region NGC 1499 (California Nebula) have been investigated with a 4′ circular field of view over a 200 km s^–1 (4.4 Å) spectral window. These measurements provide information about the densities, line widths, and radial velocities of the surrounding NGC 1499 nebula. The intensities, the radial velocities and the line widths of the Hα emission line vary from 397.75 R to 1044.14 R, –4.88 km s^–1 to –1.02 km s^–1, and 36.72 km s^–1 to 42.81 km s^–1, respectively (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)