Discovery of Raman-Scattered C II Lines in V366 Carinae with GHOST/Gemini South

TL;DR

This paper reports the first detection of Raman-scattered C II lines in V366 Carinae, demonstrating GHOST's high sensitivity and enabling comparative spectral studies of such features in symbiotic stars.

Contribution

It presents the discovery of rare Raman-scattered C II lines in V366 Carinae, expanding the known occurrences of these features in symbiotic stars.

Findings

Detection of Raman-scattered C II lines at 7023 and 7054 Å.

First identification of these features in V366 Carinae.

Highlights GHOST's capability to detect subtle spectral features.

Abstract

We report the detection of Raman-scattered C II lines at 7023 and 7054\r{A} in the symbiotic star V366 Carinae using GHOST at Gemini South. These faint features, originating from the C II doublet at ${\lambda}{\lambda}$ 1036 and 1037\r{A}, are rare and have been detected in only two other symbiotic stars: V1016 Cygni and RR Telescopii. Our findings showcase the exceptional sensitivity of GHOST to detect subtle spectral features and open the door to comparative studies of Raman-scattered C II features across these systems.