2005A&A...433.1023K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET12:22:51

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

Differential rotation of main sequence F stars.

KUEKER M. and RUEDIGER G.

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

goto Full paper

goto View the reference in ADS

Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 945 0
2 V* LQ Lup TT* 15 08 37.7352828737 -44 23 17.050344716 11.46 11.54 10.645 10.22 9.804 G8IVe 69 0
3 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 294 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005A&A...433.1023K and select 'bookmark this link' or equivalent in the popup menu


2021.03.02-12:22:51

© Université de Strasbourg/CNRS

    • Contact