L x p rot relationship
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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

Lx-Prot Relationship

Ji Wang

Department of Astronomy

University of Florida

X ray indicators

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

L x r rot relationship
Lx-Rrot Relationship

Briggs et al 2007

Preibisch et al 2005

Activity rossby number relation
Activity-Rossby Number Relation

Briggs et al 2007

Preibisch et al 2005

Possible explaination for scattering
Possible Explaination for Scattering

  • X-ray variability

    • Short term variability

    • Lerm term variability

  • Unresolved Binaries

  • Producing scatter of

  • Stardard deviation 0.7 dex

X ray and circumstellar disks
X-ray and circumstellar disks

  • Ca II Line=Accretion Tracer

Preibisch et al 2005

X ray and accretion
X-ray and Accretion

Briggs et al 2007

Possible explaination
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.


  • 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


  • 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)