Active-region plages and the Hyades anomaly?

Details Active-region plages and the Hyades anomaly? Active-region plages and the Hyades anomaly?

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..790l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Sept. 1985, p. 790-800.

Astronomy and Astrophysics

Astronomy

23

Metallicity, Star Clusters, Stellar Activity, Astronomical Photometry, Balmer Series, Big Bang Cosmology, Pleiades Cluster, Starspots, Stellar Gravitation, Stellar Magnetic Fields, Stellar Spectra

Scientific paper

The Hyades are known to differ in their photometric properties (Crawford 1969; Campbell 1984) and spectral properties (Rose 1984) from field stars of similar metal abundance. Using spectra of solar plages, it is demonstrated that the Hyades spectral anomalies are caused by excess emission from magnetic regions (plages) on the surfaces of these cluster stars. It is further speculated that the Hyades photometric anomalies arise from the same cause, but photometric data on solar plages necessary to resolve this issue are not available. The Pleiades stars and a few extreme emission stars show similar spectral anomalies, but of such magnitude to indicate that plages on Pleiades stars have higher surface brightnesses than on the sun and do not merely cover a larger fraction of the stars.

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