SIMBAD references

2017A&A...600A.120S - Astronomy and Astrophysics, volume 600A, 120-120 (2017/4-1)

Further evidence for a sub-year magnetic chromospheric activity cycle and activity phase jumps in the planet host τ Bootis.

SCHMITT J.H.M.M. and MITTAG M.

Abstract (from CDS):

We examine the S-index data, obtained in the context of the Mount Wilson H&K project for the nearby F-type star τ Boo, for the presence of possible cyclic variations on timescales below one year and "phase jump" episodes in the observed S-index activity levels, to determine whether such features are persistent properties of the chromospheric activity of τ Boo and possibly other late-type stars. Within the Mount Wilson H&K project τ Boo was observed during 1278 individual nights, albeit with a very inhomogeneous coverage ranging from 2 to 137 observations per year. Our analysis shows that periodical variations with timescales on the order of 110-120 days are a persistent feature of the Mount Wilson data set. Furthermore we provide further examples of "phase jump" episodes, when the observed S-index activity drops from maximum to minimum levels on timescales of one to two weeks, hence such features also appear to occur on a more or less regular basis in τ Boo.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: activity - stars: chromospheres - stars: late-type - stars: late-type

Simbad objects: 2

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2019.10.22-11:54:45

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