Spectral anomalies in the Hyades and Pleiades and in field stars with active chromospheres

Details Spectral anomalies in the Hyades and Pleiades and in field stars with active chromospheres Spectral anomalies in the Hyades and Pleiades and in field stars with active chromospheres

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1238r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, Aug. 1984, p. 1238-1251.

Astronomy and Astrophysics

Astronomy

91

Chromosphere, Dwarf Stars, Late Stars, Pleiades Cluster, Star Clusters, Stellar Spectra, Classifications, Giant Stars, Stellar Activity, Stellar Composition, Stellar Gravitation

Scientific paper

Widened photographic image-tube spectra at 50 Å mm-1 dispersion have been obtained for a large number of late-type field dwarfs and giants with well-determined atmospheric parameters, and for 35 Hyades dwarfs and 31 Pleiades dwarfs. The spectra have a resolution of 2.5 Å and cover the wavelength range λλ3400 - 4500 Å. A new quantitative three-dimensional spectral classification system is derived for late-type stars, and is calibrated using the sample of field dwarfs and giants with known atmospheric parameters. Diagnostic indices are defined by comparing the counts in the bottoms of two neighboring absorption lines or by comparing the counts in two neighboring pseudocontinuum peaks. It is found that the Hyades and Pleiades dwarfs and field dwarfs with strong Ca II H- and K-emission reversals exhibit well-defined anomalies in their diagnostic indices when compared with normal field dwarfs. It is proposed that active regions on stars with strong Ca II emission reversals have seriously affected many of the principal spectral lines.

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