Other
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1358e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Sept. 1984, p. 1358-1365.
Other
55
Astrometry, Chromosphere, G Stars, K Stars, Main Sequence Stars, Star Clusters, Stellar Motions, Binary Stars, Emission Spectra, H Alpha Line, Radial Velocity, Radio Spectra, White Dwarf Stars, X Ray Spectra
Scientific paper
Ten probable and four possible Hyades Supercluster members for which there is some indication of very active chromospheres (VAC) are discussed. The VAC stars in the superduster, HD 18134, V47 1 Tau B, +26°730 A, DH Leo, Z Her B and, possibly, HD 36705 lie a magnitude or more above the main sequence. Although there is evidence in one or two cases that this elevation may result from long-term light variations, the majority of the displacements can be understood by equating the VAC stars to subgiant (such as Z Her B) remnants of interacting binaries. In at least one (V471 Tau), and probably two, (DH Leo) cases, the defunct primary component is now a white dwarf. Supercluster stars with lower chromospheric activity, indicated mainly by H and K emission which may be periodically variable, are on the main sequence. Colorimetrically, the VAC stars are distinguishable from those with lower activity by an appreciable b - y deficiency (or R - I excess). The available data for other VAC indicators show that the presence of Hα emission, free-free emission in the radio continuum, and the presence of soft x-ray emission also may distinguish between the VAC and main-sequence stars.
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