COUP sees PMS coronae rotate!

E. Flaccomio, G. Micela, F. R. Harnden, S. Sciortino, S. Wolk, W. Herbst, F. Favata, E. D. Feigelson

Research output: Contribution to journalConference articlepeer-review


We present a novel results of the Chandra Orion Ultradeep Project (COUP): the detection of rotational modulation of X-ray emission from the Orion Nebula Cluster (ONC) young stars. This result is made possible by the exceptional length of the COUP observation: 10 days of ACIS integration during a time span of 13 days. We apply the Lomb Periodogram method to the X-ray light curves; comparing the thus derived rotational periods with published optically determined periods, we find evidence that the two are related. Rotational modulation is often observed in stars with saturated activity levels, indicating a substantial non homogeneity in the spatial distribution of active regions on these stars. This suggests that saturation is not due to the filling of the stellar surface with active regions.

Original languageEnglish (US)
Pages (from-to)539-542
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number560 I
StatePublished - 2005
Event13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany
Duration: Jul 5 2004Jul 9 2004

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science


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