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Differential rotation on the young solar analogue V889 Herculis

Published online by Cambridge University Press:  26 August 2011

Zsolt Kővári ,
Antonio Frasca ,
Katia Biazzo ,
Krisztián Vida ,
Ettore Marilli  and
Ömür Çakırlı
Zsolt Kővári
Affiliation:
Konkoly Observatory, Budapest, XII. Konkoly Thege út 15-17., H-1121, Hungary email: [email protected], [email protected]
Antonio Frasca
Affiliation:
INAF, Osservatorio Astrofisico di Catania, via S. Sofia, 78, 95123 Catania, Italy email: [email protected], [email protected]
Katia Biazzo
Affiliation:
INAF, Osservatorio Astrofisico di Arcetri, L.go E. Fermi, 5, 50125 Firenze, Italy email: [email protected]
Krisztián Vida
Affiliation:
Konkoly Observatory, Budapest, XII. Konkoly Thege út 15-17., H-1121, Hungary email: [email protected], [email protected]
Ettore Marilli
Affiliation:
INAF, Osservatorio Astrofisico di Catania, via S. Sofia, 78, 95123 Catania, Italy email: [email protected], [email protected]
Ömür Çakırlı
Affiliation:
Ege University, Science Faculty, Astronomy and Space Sciences Department, 35100 Bornova, Izmir, Turkey email: [email protected] TÜBITAK National Observatory, Akdeniz University Campus, 07058 Antalya, Turkey
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Abstract

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V889 Herculis is one of the brightest single early-G type stars, a young Sun, that is rotating fast enough (Prot =1.337 days) for mapping its surface by Doppler Imaging. The 10 FOCES spectra collected between 13-16 Aug 2006 at Calar Alto Observatory allowed us to reconstruct one single Doppler image for two mapping lines. The Fe i-6411 and Ca i-6439 maps, in a good agreement, revealed an asymmetric polar cap and several weaker features at lower latitudes. Applying the sheared-image method with our Doppler reconstruction we perform an investigation to detect surface differential rotation (DR). The resulting DR parameter, δΩ/Ω≈0.009 of solar type, is compared to previous studies which reported either much stronger shear or comparably weak DR, or just preferred rigid rotation. Theoretical aspects are also considered and discussed.

Keywords

Stars: activitystars: imagingstars: individual (V889 Her)stars: spotsstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 121 - 125
Copyright
Copyright © International Astronomical Union 2011

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