Indications for anti-solar differential rotation of giant stars

Details Indications for anti-solar differential rotation of giant stars Indications for anti-solar differential rotation of giant stars

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005an....326..287w&link_type=abstract

Astronomische Nachrichten, Vol.326, Issue 3, p.287-291

Astronomy and Astrophysics

Astronomy

15

Stars: Spots, Stars: Activity, Stars: Imaging, Stars: Individual (Im Peg, Hd 208472, Hk Lac, Ku Peg, Hd 31993)

Scientific paper

Observational evidence of anti-solar differential rotation of K-type giant stars is presented. Time-series Doppler imaging based on 70 nights of spectroscopic data was used to derive the spot evolution of the stellar surfaces. The relative differential rotation parameters (α) of the binary stars IM Peg, HD 208472, and HK Lac were obtained using two techniques, cross-correlation analysis and the sheared-image method. Additionally, two previously published single giant stars are revisited and qualitatively compared to recent theoretical models.

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