Line Luminosities of Galactic and Magellanic Cloud Wolf-Rayet stars

Understand

We provide line luminosities and spectroscopic templates of prominent optical emission lines of 133 Galactic Wolf-Rayet stars by exploiting Gaia DR3 parallaxes and optical spectrophotometry, and provide comparisons with 112 counterparts in the Magellanic Clouds.

• Average line luminosities of the broad blue (He II 4686, C III 4647,51, N III 4634,41, N V 4603,20) and yellow (C IV 5801,12) emission features for WN, WN/C, WC and WO stars have application in characterising the Wolf-Rayet populations of star-forming regions of distant, unresolved galaxies.
• Early-type WN stars reveal lower line luminosities in more metal poor environments, but the situation is less clear for late-type WN stars.
• LMC WC4-5 line luminosities are higher than their Milky Way counterparts, with line luminosities of Magellanic Cloud WO stars higher than Galactic stars.