Long-term X-ray variability in the Hyades cluster

Details Long-term X-ray variability in the Hyades cluster Long-term X-ray variability in the Hyades cluster

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.239..163z&link_type=abstract

In ESA Proceedings of ESA Workshop on a Cosmic X-Ray Spectroscopy Mission p 163-169 (SEE N86-22461 12-89)

Astronomy and Astrophysics

Astronomy

1

Periodic Variations, Spaceborne Astronomy, Star Clusters, X Ray Spectra, Exosat Satellite, Stellar Activity, Stellar Spectra, X Ray Astronomy

Scientific paper

Twenty Hyades stars have been observed over a period of one and a half years. Reliable results are obtained for seven of them. Only one star, the K0 III giant θ1 Tau does not exhibit X-ray variability. This result casts some doubt about the activity cycle being the explanation for the wide range of X-ray luminosities seen among the Hyades giants. The six other dwarfs exhibit variability on a time scale of few days to one and a half years. Assuming that the X-ray emission is of coronal origin, implications on the stellar coverage variations are drawn.

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