ROSAT X-Ray Detection of epsilon Taurus: Revisiting the Coronal and Transition Region Emission of the Hyades Giants

Abstract

view Abstract Citations (8) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ROSAT X-Ray Detection of epsilon Taurus: Revisiting the Coronal and Transition Region Emission of the Hyades Giants Collura, A. ; Maggio, A. ; Micela, G. ; Sciortino, S. ; Harnden, F. R., Jr. ; Rosner, R. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1993 DOI: 10.1086/173226 Bibcode: 1993ApJ...416..204C Keywords: open clusters and associations: individual (Hyades) -- stars: coronae -- stars: giant -- X-rays: stars full text sources ADS | data products SIMBAD (5) MAST (1)