Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...416..204c&link_type=abstract
Astrophysical Journal v.416, p.204
Astronomy and Astrophysics
Astronomy
6
Open Clusters And Associations: Individual (Hyades) -- Stars: Coronae -- Stars: Giant -- X-Rays: Stars
Scientific paper
We report on a recent pointed X-ray observation of the Hyades giant ɛ Tau, obtained with the ROSA T PS PC. We confirm at higher significance the earlier ROSAT all-sky survey detection of this star, with an X-ray luminosity of ˜1028 ergs s-1. ɛ Tau turns out to be the X-ray faintest among the four giants of the Hyades cluster, and the only one with no evidence of binarity. We rediscuss possible explanations, already put forward in previous studies, for the large spread in coronal and transition region emission observed among these stars. We revisit this issue in the light of our most recent knowledge on X-ray and UV emission properties of other Hyades and field stars.
Collura Alfonso
Harnden Frank R. Jr.
Maggio Antonio
Micela Giuseppina
Rosner Robert
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