Differential rotation on UZ Librae

Details Differential rotation on UZ Librae Differential rotation on UZ Librae

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...410..685o&link_type=abstract

Astronomy and Astrophysics, v.410, p.685-689 (2003)

Astronomy and Astrophysics

Astrophysics

11

Starspots, Stars: Activity, Stars: Atmospheres, Stars: Late-Type, Stars: Individual: Uz Lib, Stars: Binaries: Close

Scientific paper

We analysed a time series of nine consecutive years of high-precision photometry of the spotted RS CVn star UZ Lib by using a discrete Fourier-transform technique and a non-linear least-squares minimization. The main period of 4.77 days due to stellar rotation was resolved into three individual periods separated by -0.2% and +0.4% around the main period. The stability of the spot pattern over many years, as derived from our contemporaneous Doppler images, allowed us to relate the different periods to co-existing spots at different latitudes, and thus to the direct determination of the strength and the sign of the differential rotation. The main period originates from the equatorial surface regions and is practically the same as the orbital period from independent radial-velocity measurements, suggesting that the stellar equator is tidally locked to the orbital motion. The higher latitudes rotate slightly faster than the equator, suggesting non-solar differential rotation with a parameter of alpha =Delta Omega /Omega =-0.0026, 80 times weaker than on the solar surface, and a lap time of Pequator/alpha ~ -1800 days, i.e. 14 times longer than for the Sun.

Affiliated with

Also associated with

No associations

Rating

Differential rotation on UZ Librae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Differential rotation on UZ Librae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential rotation on UZ Librae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1086157