A CA II lambda 8662 index of chromospheric activity - The case of 61 Cygni A

Details A CA II lambda 8662 index of chromospheric activity - The case of 61 Cygni A A CA II lambda 8662 index of chromospheric activity - The case of 61 Cygni A

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..332l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 686, p. 332-336.

Astronomy and Astrophysics

Astronomy

19

Calcium, Chromosphere, Stellar Activity, Stellar Spectra, Infrared Spectra, Stellar Rotation, Variability

Scientific paper

The stellar spectra obtained in our precise velocity program include the Ca II IR triplet line at 8662 A. Changes in the core flux of this line, quantified with our Delta-EW8662 index, reflect changes in stellar chromospheric activity. In our twelve 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; these confirm earlier results based on the H and K lines. The stability of the derived rotation period over twelve years suggests that the regions of chromospheric activity are either long-lived or formed within a limited longitude range.

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