Probing Saturation in Stellar Coronae and Chromospheres: Spectral Classification and Analysis of Serendipitously Detected X-ray Sources and Their Optical Counterparts

Details Probing Saturation in Stellar Coronae and Chromospheres: Spectral Classification and Analysis of Serendipitously Detected X-ray Sources and Their Optical Counterparts Probing Saturation in Stellar Coronae and Chromospheres: Spectral Classification and Analysis of Serendipitously Detected X-ray Sources and Their Optical Counterparts

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340607w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #406.07; Bulletin of the American Astronomical Society, Vol. 41, p.199

Astronomy and Astrophysics

Astronomy

Scientific paper

The Chandra Multiwavelength Project (ChaMP) has constructed a database of 6800 X-ray sources serendipitously detected by Chandra imaging and matched to optical counterparts with high confidence. We present new optical spectral classifications for 147 X-ray bright (fX 10-14 - 10-12 ergs s-1) ChaMP sources based primarily on observations with the FAST Spectrograph on the Tillinghast 60" Telescope at Mt. Hopkins. 45 of these sources are identified as M stars with Hα emission and are combined with existing stellar spectra in the ChaMP database, creating a final sample size of 121 emitting M stars which we use to analyze the correlation between LHα/Lbol and LX/Lbol. Analysis by Covey et al. (2008) of 40 M stars in a similar sample found evidence for a turnover in the LHα/Lbol vs. LX/Lbol relationship near LX/ Lbol 3 x 10-4. Our expanded sample nearly triples the size of the sample analyzed by Covey et al. (2008) and shows no evidence of a turnover in the LHα/Lbol vs. LX/Lbol relationship. However, our analysis does corroborate the existence of a plateau at LHα/Lbol 10-3 and suggests a sample bias towards flaring stars. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.

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