2008/02/05 by M. A. Guerrero, Martin A. Guerrero, You‐Hua Chu +1 · 1 citation
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Galaxy #Large Magellanic Cloud #Physics #ROSAT #Stars #Stellar, planetary, and galactic studies #Wolf–Rayet star #astro-ph
paper · pdf · doi:10.1086/587060
To appear in The Astrophysical Journal Supplement. A version with full resolution figures can be obtained upon request to [email protected]
arxiv created 2008/02/05 · openalex publication_date 2008/06/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.