Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sfet.confe..23f&link_type=abstract
"Star Formation in the Era of Three Great Observatories, meeting abstracts from the conference held July 13-15, 2005 in Cambridg
Physics
Scientific paper
I will present results of a search for rotational modulation of X-ray light-curves in a sample of young Orion Nebula Cluster stars. The study, aiming at understanding the spatial distribution of X-ray emitting plasma on pre-main sequence stars, is part of the Chandra Orion Ultradeep Project (COUP) and was made possible by the exceptional length of the observation: 10 days of ACIS integration during a time span of 13 days, yielding a total of 1616 detected sources in the 17x17 arcmin field of view. I will focus on a subsample of 233 X-ray-bright stars with known rotational periods. X-ray modulation related to the rotation period is detected in at least 23 stars with periods between 2 and 12 days and relative amplitudes ranging from 20% to 70%. In 16 cases, the X-ray modulation period is similar to the stellar rotation period while in seven cases it is about half that value, possibly due to the presence of X-ray emitting structures at opposite stellar longitudes. These results constitute the largest sample of low mass stars in which X-ray rotational modulation has been observed. The detection of rotational modulation indicates that the X-ray emitting regions are distributed inhomogeneneously in longitude and do not extend to distances significantly larger than the stellar radius. Modulation is observed in stars with saturated activity levels (LX/Lbol ˜ 10-3) showing that saturation is not due to the filling of the stellar surface with X-ray emitting regions.
Favata Fabio
Feigelson Eric D.
Flaccomio Ettore
Harnden Frank R. Jr.
Herbst William
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