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Astrophysics > Solar and Stellar Astrophysics

arXiv:1306.2651 (astro-ph)
[Submitted on 11 Jun 2013]

Title:Magnetically Active Stars in Taurus-Auriga: Activity and Rotation

Authors:K.N. Grankin
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Abstract:A sample of 70 magnetically active stars toward the Taurus-Auriga star-forming region has been investigated. The positions of the sample stars on the Rossby diagram have been analyzed. All stars are shown to be in the regime of a saturated dynamo, where the X-ray luminosity reaches its maximum and does not depend on the Rossby number. A correlation has been found between the lithium line equivalent width and the age of a solar-mass (from 0.7 to 1.2 Msun) pre-main-sequence star. The older the age, the smaller the Li line equivalent width. Analysis of the long-term photometric variability of these stars has shown that the photometric activity of the youngest stars is appreciably higher than that of the older objects from the sample. This result can be an indirect confirmation of the evolution of the magnetic field in pre-main-sequence stars from predominantly dipole and axisymmetric to multipole and nonaxisymmetric.
Comments: 16 pages with 8 Postscript figures
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1306.2651 [astro-ph.SR]
  (or arXiv:1306.2651v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1306.2651
Journal reference: Astronomy Letters, 2013, Vol. 39, pp. 446-457
Related DOI: https://doi.org/10.1134/S1063773713070037

Submission history

From: Konstantin Grankin [view email]
[v1] Tue, 11 Jun 2013 20:33:15 UTC (58 KB)
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