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arXiv:0706.2139 (astro-ph)
[Submitted on 14 Jun 2007 (v1), last revised 11 Jul 2007 (this version, v2)]

Title:Spectral type dependent rotational braking and strong magnetic flux in three components of the late-M multiple system LHS 1070

Authors:Ansgar Reiners, Andreas Seifahrt, Hans Ulrich Käufl, Ralf Siebenmorgen, Alain Smette
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Abstract: We show individual high resolution spectra of components A, B, and C of the nearby late-M type multiple system LHS 1070. Component A is a mid-M star, B and C are known to have masses at the threshold to brown dwarfs. From our spectra we measure rotation velocities and the mean magnetic field for all three components individually. We find magnetic flux on the order of several kilo-Gauss in all components. The rotation velocities of the two late-M objects B and C are similar (vsini = 16km/s), the earlier A component is spinning only at about half that rate. This suggests weakening of net rotational braking at late-M spectral type, and that the lack of slowly rotating late-M and L dwarfs is real. Furthermore, we found that magnetic flux in the B component is about twice as strong as in component C at similar rotation rate. This indicates that rotational braking is not proportional to magnetic field strength in fully convective objects, and that a different field topology is the reason for the weak braking in low mass objects.
Comments: accepted for publication as A&A Letter
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.2139 [astro-ph]
  (or arXiv:0706.2139v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2139
Related DOI: https://doi.org/10.1051/0004-6361%3A20077964

Submission history

From: Ansgar Reiners [view email]
[v1] Thu, 14 Jun 2007 14:57:13 UTC (59 KB)
[v2] Wed, 11 Jul 2007 07:37:59 UTC (59 KB)
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