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- W4230187504 abstract "We construct revised near-infrared absolute magnitude calibrations for 126 Galactic Wolf-Rayet (WR) stars at known distances, based in part upon recent large scale spectroscopic surveys. Application to 246 WR stars located in the field, permits us to map their galactic distribution. As anticipated, WR stars generally lie in the thin disk (~40pc half width at half maximum) between galactocentric radii 3.5-10kpc, in accordance with other star formation tracers. We highlight 12 WR stars located at vertical distances of >300pc from the midplane. Analysis of the radial variation in WR subtypes exposes a ubiquitously higher N_{WC}/N_{WN} ratio than predicted by stellar evolutionary models accounting for rotation. Models for non-rotating stars or accounting for close binary evolution are more consistent with observations. We consolidate information acquired about the known WR content of the Milky Way to build a simple model of the complete population. We derive observable quantities over a range of wavelengths, allowing us to estimate a total number of 1200(+300,-100) Galactic WR stars, implying an average duration of ~0.25Myr for the WR phase at the current Milky Way star formation rate. Of relevance to future spectroscopic surveys, we use this model WR population to predict follow-up spectroscopy to K_S ~ 13 mag will be necessary to identify 95% of Galactic WR stars. We anticipate that ESA's Gaia mission will make few additional WR star discoveries via low-resolution spectroscopy, though will significantly refine existing distance determinations. Appendix A provides a complete inventory of 322 Galactic WR stars discovered since the VIIth catalogue (313 including Annex), including a revised nomenclature scheme." @default.
- W4230187504 created "2022-05-11" @default.
- W4230187504 creator A5044174522 @default.
- W4230187504 creator A5068280975 @default.
- W4230187504 date "2015-01-08" @default.
- W4230187504 modified "2023-10-13" @default.
- W4230187504 title "Spatial distribution of Galactic Wolf–Rayet stars and implications for the global population" @default.
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