ROSAT Guest Observer Facility

PSPC: The Pleiades


Image credit: Max-Planck-Institut für extraterrestrische Physik (MPE)

The Pleiades is an open stellar cluster that is easily visible to the naked eye in the northern hemisphere. Its stars, numbering more than 500 members, lie only about 130 parsecs (1 parsec = 3.26 light years) away from the sun. The cluster is only about 70 million years old; its member stars are very young compared to the 4.5 billion year old sun. This PSPC image of the central region of the Pleiades shows that many of these very young stars are X-ray sources at levels that are up to a thousand times higher than that of the sun. Systematic X-ray surveys of the Pleiades by ROSAT have now identified of order of 170 cluster stars as X-ray emitters.

Curator: Michael Arida (ADNET);
HEASARC Guest Observer Facility

Please use the Feedback link if you have questions on ROSAT.

This file was last modified on Tuesday, 25-Aug-2020 18:01:42 EDT

NASA Astrophysics

  • FAQ/Comments/Feedback
  • Education Resources
  • Download Adobe Acrobat
  • A service of the Astrophysics Science Division (ASD) at NASA/ GSFC

    ROSAT Project Scientist: Dr. Robert Petre

    Responsible NASA Official: Phil Newman

    Privacy Policy and Important Notices.