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2008MNRAS.387..220R - Mon. Not. R. Astron. Soc., 387, 220-236 (2008/June-2)
High-precision orbital parameters for the short-period spectroscopic binary HD159656 - an eccentric orbit confirmed for an old but active system.
RAMM D.J.
Abstract (from CDS):
HD159656 is a standard star in many photometric systems. However, a small sample of our spectra indicates that the CaII H&K line emission, that we demonstrate arises principally from the primary, is variable. Furthermore, ROSAT data of an X-ray source probably coincident with HD159656 provide evidence of flare activity. Such behaviour is more typical of M-dwarf stars and so may be more properly associated with the secondary, if it is of this spectral type. If the binary is tidally locked, this could explain the activity of this system, which implies a chromospheric age an order of magnitude less than the isochrone age. The spectra reveal a very low lithium abundance for the primary component, together with many other spectral characteristics and photometric colours that are typical of solar analogues. Thus the primary star represents an example of the behaviour of solar analogues in this astrophysical context.
Abstract Copyright: © 2008 The Author. Journal compilation © 2008 RAS
Journal keyword(s): techniques: radial velocities - stars: activity - binaries: spectroscopic - stars: fundamental parameters - stars: individual: HD159656
Simbad objects: 21
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