Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..275r&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars , Stellar Systems, and the Sun (2001 July 30 - Augus
Astronomy and Astrophysics
Astrophysics
Ψ Cap, Stellar Dynamo, Differential Rotation
Scientific paper
Differential rotation has been detected on the fast rotator ψ Cap (F5 V) using line profile analysis. The Fourier transforms of both Fe I λ5775 and Si I λ5772 are used to obtain a projected rotational velocity of v sin{i} = 42 ± 1 km s-1. Modelling of the Fourier transformed profiles shows that the combined effects of equatorial velocity, inclination and differential rotation dominate the line profile while limb darkening and turbulence velocities have only minor effects. Rigid rotation is shown to be inconsistent with the measured profiles. Modelling the line profiles analogous to solar differential rotation we find a differential rotation parameter of α = 0.15 ± 0.1 comparable to the solar case. To our knowledge this is the first successful measurement of differential rotation through line profile analysis. A check with an observable directly obtained from the Fourier transform shows the internal consistency of our results.
Kürster Martin
Reiners Ansgar
Schmitt Juergen H. M. M.
No associations
LandOfFree
Detection of Differential Rotation in ψ Cap with Profile Analysis 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 Detection of Differential Rotation in ψ Cap with Profile Analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of Differential Rotation in ψ Cap with Profile Analysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-916942