A CA II lambda 8662 index of chromospheric activity - The case of 61 Cygni A
Publications of the Astronomical Society of the Pacific1993Vol. 105, pp. 332–332
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Ana M. Larson, Alan W. Irwin, Stephenson Yang, C. Goodenough, G. A. H. Walker, A. R. Walker, D. Bohlender
Abstract
The stellar spectra obtained in our precise velocity program include the Ca II infrared triplet line at lambda-8662. Changes in the core flux of this line, quantified with our Delta-EW8662 index, reflect changes in stellar chromospheric activity. In our 12 years of Ca II observations for 61 Cygni A, we detect a solar-type cycle of 7.22 years and a rotational period of 36.21 days which confirm earlier results based on the H and K lines. The stability of the derived rotation period over 12 years suggests that the regions of chromospheric activity are either long-lived or formed within a limited-longitudal range.
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