Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..145l&link_type=abstract
Astronomy and Astrophysics, v.306, p.145
Astronomy and Astrophysics
Astrophysics
Stars: Activity, Stars: Rotation, Stars: Variables, Space Vehicles
Scientific paper
A method for the evaluation of latitudinal differential rotation in active solar-like stars is proposed. It is based on the Fourier analysis of the time-dependent modulation produced by spots on the spectral line profiles and can be applied to stars for which line broadening is dominated by rotation, i.e., with a projected equatorial rotation velocity of at least 20-30km/s. With a spectral resolution of (λ)/({DELTA}λ)>=20000-60000, a signal-to-noise ratio (S)/(N)~250-500 and an uninterrupted time coverage of (2π)/({DELTA}{OMEGA}) with at least 5-10 measurements per period, a surface differential rotation of amplitude {DELTA}{OMEGA} can usually be detected and information on the sign of (d{OMEGA})/(dφ), where φ is the stellar latitude, can be derived. The above requirements support the importance of dedicated observations from satellites or a network of Moon-based telescopes.
Lanza Antonino Francesco
Rodono' Marcello
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