Query : 2005A&A...433.1023K

2005A&A...433.1023K - Astronomy and Astrophysics, volume 433, 1023-1030 (2005/4-3)

Differential rotation of main sequence F stars.


Abstract (from CDS):

The differential rotation of a 1.2M zero age MS star (spectral type F8) is computed and the results are compared with those from a similar model of the Sun. The rotation pattern is determined by solving the Reynolds equation including the convective energy transport. The latter is anisotropic due to the Coriolis force causing a horizontal temperature gradient of 7K between the poles and the equator. Comparison of the transport mechanisms of angular momentum (the eddy viscosity, the Λ-effect and the meridional flow) shows that for the F star the Λ-effect is the most powerful transporter for rotation periods of 7d or less. In the limit of very fast rotation the Λ-effect is balanced by the meridional flow alone and the rotation is nearly rigid. The rotation pattern found for the F star is very similar to the solar rotation law, but the horizontal shear is about twice the solar value. As a function of the rotation period, the total equator-pole difference of the angular velocity has a (slight) maximum at a period of 7d and (slowly) vanishes in both the limiting cases of very fast and very slow rotation. A comparison of the solar models with those for the F-type star shows a much stronger dependence of the differential surface rotation on the stellar luminosity rather than on the rotation rate (see Fig. 6).

Abstract Copyright:

Journal keyword(s): Sun: rotation - stars: rotation - convection

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1023 0
2 V* LQ Lup TT* 15 08 37.7353724976 -44 23 17.049423444 11.46 11.54 10.645 10.22 9.804 G8IVe 84 0
3 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 332 0

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