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L x -P rot Relationship

L x -P rot Relationship. Ji Wang Department of Astronomy University of Florida. L x and F x are anticorrelated with P rot at slope of -1(99% significance) L x /L * has no significant anticorrelation with P rot. X-ray indicators. Briggs et al 2007. L x -R rot Relationship.

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L x -P rot Relationship

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  1. Lx-Prot Relationship Ji Wang Department of Astronomy University of Florida

  2. Lx and Fx are anticorrelated with Prot at slope of -1(99% significance) Lx/L* has no significant anticorrelation with Prot X-ray indicators Briggs et al 2007

  3. Lx-Rrot Relationship Briggs et al 2007 Preibisch et al 2005

  4. Activity-Rossby Number Relation Briggs et al 2007 Preibisch et al 2005

  5. Possible Explaination for Scattering • X-ray variability • Short term variability • Lerm term variability • Unresolved Binaries • Producing scatter of • Stardard deviation 0.7 dex

  6. X-ray and circumstellar disks • Ca II Line=Accretion Tracer Preibisch et al 2005

  7. X-ray and Accretion Briggs et al 2007

  8. Possible explaination • Low X-ray luminosity due to higher extinction • Disk-braking mechanism • magnetic reconnection can not heat the dense plasma in mass-loaded accreting field lines to X-ray temperatures.

  9. Conclusions • Lx and Fx are anticorrelated with Prot, but Lx/L* is correlated or has no dependence on Prot • The scattering in Lx-Prot relationship for young stars is an combining force of X-ray variability and accreting TTSs. • Relative lower Lx/L* for accreting TTSs is due to the fact that magnetic reconnection cannot heat up dense plasma in mass-loaded accretion region

  10. Reference • Preibisch, T., Kim, Y.-C., Favata, F. et al. 2005, ApJS, 160, 401 • K. R. Briggs, M. Güdel, A. Telleschi, T. Preibisch, B. Stelzer, J. Bouvier, L. Rebull, M. Audard, L. Scelsi, G. Micela, N. Grosso, and F. Palla A&A 468, 413–424 (2007)

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