The Connection Between Optical and X-ray Variability in Pre-Main-Sequence Stars

Details The Connection Between Optical and X-ray Variability in Pre-Main-Sequence Stars The Connection Between Optical and X-ray Variability in Pre-Main-Sequence Stars

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..624s&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Mathematics

Logic

Interstellar Medium And Nebulae In External Galaxies, X-Ray Absorption Spectra, Magnetic And Electric Fields, Polarization Of Starlight

Scientific paper

We have assembled a database of simultaneous X-ray and optical light curves for more than 800 pre-main-sequence (PMS) stars in the Orion Nebula Cluster (ONC), representing the largest multi-wavelength-regime time-series study of young stars to date. The aim of this study is to establish the relationship, if any, between the sites of optical and X-ray variability and thereby to elucidate the origins of X-ray production in PMS stars. For more than 95% of the stars in our study, no evidence for time-correlated X-ray and optical variations are observed in the X-ray and optical light curves. However, a strong and highly statistically significant correlation is found between optical variability and average X-ray luminosity. As this correlation is found to be independent of accretion activity, we argue that X-ray production in PMS stars must instead be intimately connected with the presence and strength of optically variable, magnetically active surface regions (i.e., spots) on these stars. Moreover, because X-ray variability and optical variability are rarely time-correlated, we conclude that the sites of X-ray production are not exclusively cospatial with these regions. We argue that solar-analog coronae, heated by topologically complex fields, can explain these findings.

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