Further observations of the He I 10830 A chromospheric line in stars

Details Further observations of the He I 10830 A chromospheric line in stars Further observations of the He I 10830 A chromospheric line in stars

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apjs...65..255l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 65, Oct. 1987, p. 255-271.

Astronomy and Astrophysics

Astrophysics

30

Chromosphere, Giant Stars, Helium Ions, Spectral Line Width, Stellar Spectra, Stellar Spectrophotometry, K Stars, Stellar Coronas, Variable Stars

Scientific paper

Observations obtained from July 1983 to January 1987 of the chromospheric He I triplet at 10830 A are presented for 19 late-type stars. The results confirm the suggestion by O'Brien and Lambert (1986) that the 10830 A feature in K giants to the left of the coronal dividing line (CDL) is broad, shallow, and constant. Arcturus and Gamma Dra to the right of the CDL are found to show a variable 10830 A feature. The variations appear to be periodic for Alpha Boo, with a basic interval of about 78 days. It is suggested that the rotational period is about 233 days. For Gamma Dra the He I triplet was in emission with a variable equivalent width from 1983 to 1987.

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