Detailed optical spectroscopy of the B[e] star MWC 17

TL;DR

This study provides detailed optical spectroscopy of the B[e] star MWC 17, identifying spectral features and measuring velocities, revealing its spectral stability over time.

Contribution

It offers the first high-resolution spectral analysis of MWC 17, identifying emission lines and systemic velocity, and comparing data to previous observations for variability assessment.

Findings

Identified numerous permitted and forbidden emission lines.

Estimated systemic velocity at -47 km/s.

Found no significant spectral variability over time.

Abstract

Based on the data of multiple high-resolution R=60 000 observations obtained at the 6-meter telescope BTA in combination with the NES spectrograph, we studied the features of the optical spectrum of the star MWC 17 with the B[e] phenomenon. In the wavelength interval 4050-6750 A we identified numerous permitted and forbidden emissions, interstellar NaI lines, and diffuse interstellar bands (DIBs). Radial velocities were estimated from lines of various origin. As the systemic velocity, Vsys, the velocity from the forbidden emissions can be accepted: Vr=-47 km/s (relative to the local standard Vlsr=-42 km/s). Comparison of the obtained data with the ealier measurements allows us to conclude on the absence of considerable variability of spectral details.