B[e]-star CI Cam: a high-resolution spectrum atlas in the range of 395$\div$780 nm

TL;DR

This paper presents a detailed high-resolution spectral atlas of the B[e] star CI Cam across 395-780 nm, revealing complex emission features and confirming its supergiant status.

Contribution

The study provides the first comprehensive high-resolution spectral atlas of CI Cam, illustrating its diverse emission features and complex circumstellar environment.

Findings

About 400 spectral features identified

Dominance of FeII and [FeII] emissions

Confirmation of CI Cam's supergiant status

Abstract

The atlas of the spectrum of the B[e] star CI Cam obtained with the 6-meter BTA telescope in combination with the NES spectrograph in the wavelength interval of 395$\div$780 nm with a resolution of $\lambda/\Delta\lambda\ge60\,000$ is presented. The atlas contains about 400 spectral features and illustrates the diversity of spectral features of the unique star, forming in a complex circumstellar environment. The spectrum is dominated by forceful single-peaked HI, HeI emissions and numerous double-peaked permitted and forbidden emissions of ions of chemical elements starting from the CNO triad up to metals (Mg, Al, Ti, V, Cr, Fe) with practically ``rectangular'' profiles. The FeII and [FeII] emissions predominate in the spectrum. However, several other double-peaked forbidden ion emissions were also detected: [VII], [Cr II], [Ni II]. The atlas is presented graphically, with a separate figure corresponding to each echelle order. A list of identified lines, including a number of known interstellar features is presented in table form. CI Cam supergiant status has been confirmed.