An x-ray survey of Wolf-Rayet stars in the magellanic clouds. II. The ROSAT PSPC and HRI data sets

Martín A. Guerrero, You Hua Chu

Research output: Contribution to journalArticlepeer-review

Abstract

Wolf-Rayet (WR) stars in the Magellanic Clouds (MCs) are ideal for studying the production of X-ray emission by their strong fast stellar winds. We have started a systematic survey for X-ray emission from WR stars in the MCs using archival Chandra, ROSAT, and XMM-Newton observations. In Paper I, we reported the detection of X-ray emission from 29 WR stars using Chandra ACIS observations of 70 WR stars in the MCs. In this paper, we report the search and analysis of archival ROSAT PSPC and HRI observations of WR stars. While useful ROSAT observations are available for 117 WR stars in the MCs, X-ray emission is detected from only seven of them. The detection rate of X-ray emission from MCs WR stars in the ROSAT survey is much smaller than in the Chandra ACIS survey, illustrating the necessity of high angular resolution and sensitivity. LMC-WR 101-102 and 116 were detected by both ROSAT and Chandra, but no large long-term variations are evident.

Original languageEnglish (US)
Pages (from-to)238-254
Number of pages17
JournalAstrophysical Journal, Supplement Series
Volume177
Issue number1
DOIs
StatePublished - Jul 2008

Keywords

  • Magellanic clouds
  • Stars: Wolf-Rayet
  • Surveys
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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