Conference paper Open Access

Unlocking Galactic Wolf-Rayet stars with Gaia DR2

Rate, Gemma; Crowther, Paul A.


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.3233991", 
  "title": "Unlocking Galactic Wolf-Rayet stars with Gaia DR2", 
  "issued": {
    "date-parts": [
      [
        2019, 
        5, 
        28
      ]
    ]
  }, 
  "abstract": "<p>Wolf-Rayet (WR) stars represent the final evolutionary stage of the most massive O stars and can reveal much about<br>\nmassive star origins and fates. We can study their formation and frequency of binary interaction, by measuring<br>\nthe fraction in clusters and associations and identifying runaways far from the Galactic plane. Additionally, their<br>\nabsolute magnitudes and luminosities remain poorly constrained in the Milky Way. Accurate distances to individual<br>\nstars are required to improve our knowledge of WR stars. Past work relied upon absolute magnitude calibrations<br>\nto find distances, with large associated uncertainties. Parallaxes give more precise results and Gaia DR2 (Gaia<br>\nCollaboration et al., 2018) expands the number of WR stars with parallaxes from one star to several hundred. Here<br>\nwe have calculated new distances to 382 WR stars using DR2 astrometry. We also calculate absolute magnitudes for<br>\nstars with distances. 184 are plausible, confirming these stars have reliable distances. Recalculated luminosities are<br>\nfound to be lower than expected, potentially indicating binary interaction or requiring improved single star models.<br>\nWe confirm only a small proportion (13%) of WR stars are definitely members of clusters or associations, implying<br>\nmany WR stars may form in relatively sparse environments. We also search for runaways by applying a vertical<br>\ncutoff distance of 156pc from the Galactic midplane. 31 stars (8%) exceed this distance and so are likely runaways.<br>\nThe low fraction of binary companions, combined with the low frequency of clusters and association membership,<br>\nleads us to conclude that supernovae from close binary companions are the dominant source of runaways.</p>\n\n<p>&nbsp;</p>", 
  "author": [
    {
      "family": "Rate, Gemma"
    }, 
    {
      "family": "Crowther, Paul A."
    }
  ], 
  "id": "3233991", 
  "event-place": "ESTEC (Noordwijk, The Netherlands)", 
  "version": "1", 
  "type": "paper-conference", 
  "event": "53rd ESLAB symposium: the Gaia universe"
}
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