2005MNRAS.357L...1B


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.28CET23:07:03

2005MNRAS.357L...1B - Mon. Not. R. Astron. Soc., 357, L1-L5 (2005/February-2)

The dependence of differential rotation on temperature and rotation.

BARNES J.R., COLLIER CAMERON A., DONATI J.-F., JAMES D.J., MARSDEN S.C. and PETIT P.

Abstract (from CDS):

We use Doppler imaging techniques to determine the dependence of starspot rotation rates on latitude in an homogeneous sample of young, rapidly rotating solar analogues. A solar-like differential rotation law is used, where the rotation depends on sin2θ, where θ is the stellar latitude. By including this term in the image reconstruction process, using starspots as tracers, we are able to determine the magnitude of the shear over more than one rotation cycle. We also consider results from matched filter starspot tracking techniques, where individual starspot rotation rates are determined. In addition we have re-analysed published results and present a new measurement for the K3 dwarf Speedy Mic.

A total of 10 stars of spectral type G2-M2 are considered. We find a trend towards decreasing surface differential rotation with decreasing effective temperature. The implied approach to solid body rotation with increasing relative convection zone depth implies that the dynamo mechanism operating in low-mass stars may be substantially different from that in the Sun.


Abstract Copyright: 2004 RAS

Journal keyword(s): line: profiles - methods: data analysis - techniques: miscellaneous - stars: activity - stars: atmospheres - stars: late-type

Status at CDS:  

CDS comments: VXR 54a is a misprint for VXR 45a, VXR 45a = VXR PSPC 45a.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 923 0
2 V* V370 Vel BY* 08 42 14.7557674323 -52 56 02.331406760   11.51 10.462   9.620 G9V 20 0
3 V* LQ Hya BY* 09 32 25.5684079124 -11 11 04.687410738 9.316 8.761 7.891 7.288 6.815 K1Vp 398 0
4 V* V557 Car BY* 10 42 41.5159999215 -64 21 04.332236022   11.26 12.03     G2V 51 0
5 V* LQ Lup TT* 15 08 37.7352828737 -44 23 17.050344716 11.46 11.54 10.645 10.22 9.804 G8IVe 65 0
6 V* EY CrA Mi* 18 03 19.6499278835 -37 06 00.873907708       12.40   ~ 2 0
7 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 244 0
8 V* BO Mic BY* 20 47 44.9892114361 -36 35 40.819135413   10.39 9.337   8.216 K3V(e) 163 0
9 BD+22 4409 BY* 21 31 01.7141405072 +23 20 07.370852589   10.28 9.253 8.6 7.965 K3Vke 150 0
10 V* HK Aqr BY* 23 08 19.5510988144 -15 24 35.768241707 13.4 12.282 10.872 9.964 9.019 M0Ve 182 0

    Equat.    Gal    SGal    Ecl

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2020.03.28-23:07:03

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