Ms. Marianne Ruest Profile

Marianne Ruest

at Université Laval

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Proceedings Article | 29 August 2022 Poster + Paper

The Crescent Nebula and its hundreds of line-of sight stars as seen with the imaging FTS SITELLE

Marianne Ruest, Camille Poitras, Laurent Drissen, Nicole St-Louis

Proceedings Volume 12184, 121846A (2022) https://doi.org/10.1117/12.2627506

KEYWORDS: Stars, Fourier transforms, Absorption, Optical filters, Spectroscopy, Kinematics

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The Crescent Nebula, NGC 6888, has long been the muse of many scientific and amateur research. However, the recent data provided by SITELLE, a wide-field imaging Fourier transform spectrometer at the Canada-France-Hawaii telescope call for new analysis and conclusions. The spectral cubes offer a field of view of 11 × 11 arcminutes2 and have been acquired trough 5 different filter-selected bands covering the optical waveband (from 350 to 680 nm), allowing 23 characteristic emission optical lines to be described with a spectral resolution reaching up to 2500. Doppler shifting allow two-components velocity fits, describing the multi-layered bubble’s kinematics. The sulfur doublet describes electronic densities. Other faint lines (including [NII] 5755, [OIII] 4363 and NeIII 3868) are essential to determine accurate temperatures and abundances. Emission lines are key to this nebular research, but absorption lines in the spectrum of hundreds of field stars are also studied. All this leads to a more complete physical description of NGC 6888, its central star WR136 and the stars present in the field of view.

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