Spectral and Temporal Classification of X-ray Sources in Young Stellar Clusters

Details Spectral and Temporal Classification of X-ray Sources in Young Stellar Clusters Spectral and Temporal Classification of X-ray Sources in Young Stellar Clusters

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7606h&link_type=abstract

American Astronomical Society Meeting 210, #76.06; Bulletin of the American Astronomical Society, Vol. 39, p.183

Astronomy and Astrophysics

Astrophysics

Scientific paper

Luminous, highly variable X-ray emission is one of the defining characteristics of low-mass, pre-main sequence (PMS) stars. A very wide range of temporal behavior has been observed in Chandra and XMM-Newton observations, ranging from rotational modulation, to multiple, non-periodic X-ray bursts, to highly energetic flares lasting hours or days. Building on our recently developed method for unsupervised classification of CCD X-ray spectra (Hojnacki et al. 2007, ApJ, 659, 585), which uses X-ray CCD photon event data to determine natural spectral groupings, we present preliminary results from a study of the combination of variability indicators and raw spectral data for purposes of PMS X-ray source classification. Our objective is to determine the utility of using temporal properties and variability indicators to sort and classify discrete sources of X-ray emission.
This research is supported by NASA under AISRP award NNG04GQ07G and Chandra award AR5-6004X issued by the Chandra X-Ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060.

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