Five WC9 stars discovered in the AAO/UKST Hα survey

E. C. Hopewell*, M. J. Barlow, J. E. Drew, Y. C. Unruh, Q. A. Parker, M. J. Pierce, P. A. Crowther, C. Knigge, S. Phillipps, A. A. Zijlstra

*Corresponding author for this work

Research output: Contribution to journalReview article

10 Citations (Scopus)


We report the discovery of five massive Wolf-Rayet (WR) stars resulting from a programme of follow-up spectroscopy of candidate emission-line stars in the Anglo-Australian Observatory United Kingdom Schmidt Telescope (AAO/UKST) Southern Galactic Plane Hα survey. The 6195-6775 Å spectra of the stars are presented and discussed. A WC9 class is assigned to all five stars through comparison of their spectra with those of known late-type WC stars, bringing the known total number of Galactic WC9 stars to 44. Whilst three of the five WC9 stars exhibit near-infrared (NIR) excesses characteristic of hot dust emission (as seen in the great majority of known WC9 stars), we find that two of the stars show no discernible evidence of such excesses. This increases the number of known WC9 stars without NIR excesses to seven. Reddenings and distances for all five stars are estimated.

Original languageEnglish
Pages (from-to)857-866
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 1 Nov 2005



  • Circumstellar matter
  • Galaxy: stellar content
  • Stars: Wolf-Rayet
  • Surveys

Cite this

Hopewell, E. C., Barlow, M. J., Drew, J. E., Unruh, Y. C., Parker, Q. A., Pierce, M. J., ... Zijlstra, A. A. (2005). Five WC9 stars discovered in the AAO/UKST Hα survey. Monthly Notices of the Royal Astronomical Society, 363(3), 857-866.