A Census of Variability in ChESS

Details A Census of Variability in ChESS A Census of Variability in ChESS

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0101p&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.01; Bulletin of the American Astronomical Society, Vol. 38, p.329

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a study of the variability in stellar X-ray sources detected serendipitously in Chandra observations. These sources are part of the ChaMP Extended Stellar Survey (ChESS) catalog. ChESS is a subset of the Chandra Multiwavelength Project (ChaMP; Green et al. 2004, Kim et al. 2004) and covers the epochs 1999-2001. We use a Bayesian blocks technique on the time-ordered event lists of ChESS X-ray sources to detect variability, and thus obtain a subset of stellar sources which exhibit significant changes in intensity. The variability found is generally irregular and comprises a variety of strengths and time-scales, ranging from slow changes in intensity to multiple flaring. We carry out a uniform and comprehensive analysis of the lightcurves to determine simple characteristics of the stellar coronae.
This research was supported by NASA contract NAS8-39073 to the Chandra X-ray Center.

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