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Observations of the core of the Pleiades with the Chandra X-ray Observatory

By Anita Krishnamurthi, Christopher S. Reynolds and Jeffrey L. Linsky


We present results from a 36-ksec observation of the core of the Pleiades open cluster using ACIS-I on the Chandra X-ray Observatory. We have detected 57 sources, most of which do not have previously known optical counterparts. Follow-up photometry indicates that many of the detections are likely to be AGNs, in accordance with extragalactic source counts, but some of the sources may be previously undiscovered low-mass members of the Pleiades. We discuss our dataset and our ndings about X-ray emission from early-type stars as well as very late type stars. In particular, the large X-ray uxes, lack of variability, and hardness ratios of the four Pleiades B6 IV { F4 V stars suggest a tentative conclusion that Pleiades stars in this spectral type range are intrinsic X-ray sources rather than previously unknown binaries in which the X-ray emission is from a late-type companion. Also the sensitivity of Chandra allowed us to detect nonare X-ray emission from late-M stars. Subject headings:..

Topics: Hubble Fellow { 2
Year: 2007
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