Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...393l..77r&link_type=abstract
Astronomy and Astrophysics, v.393, p.L77-L80 (2002)
Astronomy and Astrophysics
Astrophysics
7
Stars: Abundances, Stars: Evolution, Stars: Rotation
Scientific paper
We report the detection of strong differential rotation on ten fast rotating (v sin i > 10 km s-1) stars of spectral types F0-G0 using the Fourier Transform Method, in three cases we find alpha > 20%. Among the six differential rotators with v sin i > 15 km s-1, five have Li abundances of log epsilon (Li) < 1.5, for one object no Li abundance is available to our knowledge. No differentially rotating star with high Li abundance was found, although the average Li abundance of fast rotators in the literature is log epsilon (Li) > 2.0. Our results suggest that Li-depleted fast rotators tend to show differential rotation. Interpreting high rotational velocity as indicator of youth, this finding supports the idea of the connection between mixing processes and differential rotation during magnetic breaking in F-stars. Based on observations collected at the European Southern Observatory, La Silla.
Reiners Ansgar
Schmitt Juergen H. M. M.
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