Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...591..498z&link_type=abstract
The Astrophysical Journal, Volume 591, Issue 1, pp. 498-498.
Astronomy and Astrophysics
Astronomy
Errata, Addenda
Scientific paper
In the original paper, the energy of tidal interaction (§ 3, sixth paragraph) must be estimated as ~GM2R2/d3. Then the rest of paragraph must read as follows: ``The energy of tidal interaction is ~GM2R2/d3, where d is the orbital separation. Then, for an orbital separation d~100R, this energy is of the order of 1043 ergs. The total magnetic field energy is expressed by: B2/2μ(4/3)πR3. If we assume that all the tidal interaction energy goes into magnetic field energy, we get a mean equipartition magnetic field of B~105 G, but this is clearly an upper limit. Indeed, this result is obtained in the ideal case that the whole tidal interaction energy is converted into the magnetic one. For a more realistic situation let us suppose that, due to viscous and ohmic dissipation, the energy conversion efficiency is only 1%. Even with this low efficiency, the magnetic field strength can attain values as high as greater than 104 G, which are comparable to those commonly believed to exist at the base of the convection zone of the Sun and active stars. These values are similar to the surface fields measured in very active stars that may reach 104 G or more.''
Belvedere Gaetano
Javakhishvili G.
Zaqarashvili T.
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