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We present first results of a Chandra X-ray observation of the rareoxygen-type Wolf-Rayet star WR 142 (= Sand 5 = St 3) harbored in the young,heavily-obscured cluster Berkeley 87. Oxygen type WO stars are thought to bethe most evolved of the WRs and progenitors of supernovae or gamma ray bursts.As part of an X-ray survey of supposedly single Wolf-Rayet stars, we observedWR 142 and the surrounding Berkeley 87 region with Chandra ACIS-I. We detect WR142 as a faint, yet extremely hard X-ray source. Due to weak emission, itsnature as a thermal or nonthermal emitter is unclear and thus we discussseveral emission mechanisms. Additionally, we report seven detections and eightnon-detections by Chandra of massive OB stars in Berkeley 87, two of which arebright yet soft X-ray sources whose spectra provide a dramatic contrast to thehard emission from WR 142.

Chandra Detects the Rare Oxygen-type Wolf-Rayet Star WR 142 and OB Stars in Berkeley 87