Survey of nebulae around galactic Wolf-Rayet stars in the southern sky. II

P. Marston, D. R. Yocum, G. Garcia-Segura, Y. H. Chu

Research output: Contribution to journalArticlepeer-review

Abstract

We present the second half of a CCD narrow-band imaging survey of galactic Wolf-Rayet stars located in the southern hemisphere as listed by van der Hucht et al. (1981). Images of 50 Wolf-Rayet stars were taken using a wide-field CCD and narrowband interference filters centered on Hα and [O III] 5007 Å wavelengths. The first half of the survey (Marston, Chu, & Garcia-Segura 1993, hereafter Paper I) revealed six new ring nebulae residing around Wolf-Rayet stars. Here we reveal a possible 11 new rings and the existence of multiple rings associated with two previously known nebula, RCW 118 and G2.4+1.4 and around the stars WR 16 and WR 43. Combining our results with those of Miller & Chu (1993) and Paper I, 92% of the van der Hucht catalog of Wolf-Rayet stars have now been surveyed. Of the 145 Galactic Wolf-Rayet stars now surveyed, more than a quarter have associated ring nebula. Of the 38 possible ring nebulae found in our surveys to date, 22 reside around WN subtype Wolf-Rayet stars, 13 around WC stars, one around a triplet of Wolf-Rayet stars and one around a WO star (WR 102). One ring exists around a WN/WC star (WR 98). A bias toward rings being observed around W-R + OB binaries is noted. Such pairings are generally bright, and the detection of a ring around them may merely be a function of their combined luminosity. Several Wolf-Rayet stars are shown to be surrounded by multiple rings (two or three) which suggests that a number of ejections of stellar material have taken place during their evolution.

Original languageEnglish (US)
Pages (from-to)151-155
Number of pages5
JournalAstrophysical Journal, Supplement Series
Volume95
Issue number1
DOIs
StatePublished - 1994

Keywords

  • H II regions
  • Stars: Wolf-Rayet

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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