Stellar differential rotation from line profiles: Observational evidence for correlations with temperature and rotation

Details Stellar differential rotation from line profiles: Observational evidence for correlations with temperature and rotation Stellar differential rotation from line profiles: Observational evidence for correlations with temperature and rotation

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517403r&link_type=abstract

American Astronomical Society Meeting 205, #174.03; Bulletin of the American Astronomical Society, Vol. 37, p.377

Astronomy and Astrophysics

Astronomy

Scientific paper

Differential rotation can be detected in Doppler broadening profiles of moderately rapid rotators. Accurate broadening functions have been derived in more than 700 rapidly rotating stars of spectral types A8--G5 using a least-squares deconvolution technique. Incorporating as many as 300 absorption lines, the accuracy of the resulting profile permits analysis of the rotation law in more than 350 stars which are apparently not contaminated by spots. Significant signatures of strong solar-like differential rotation, i.e., the equator rotating more than 10% faster than the poles, have been detected in about twenty stars of various temperatures and rotational velocities. I show that stars rotating as rapidly as v sin {i} = 100 km/s show signatures of differential rotation, and discuss how the fraction of strongly differentially rotating stars depends on rotation and temperature.
I acknowledge research funding from the European Commission's Sixth Framework Programme as an Outgoing International Fellow.

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