SIMBAD references

2019A&A...621A.136M - Astronomy and Astrophysics, volume 621A, 136-136 (2019/1-1)

Discovery of short-term activity cycles in F-type stars.

MITTAG M., SCHMITT J.H.M.M., HEMPELMANN A. and SCHRODER K.-P.

Abstract (from CDS):

Previous studies have revealed a 120 day activity cycle in the F-type star τ Boo, which represents the shortest activity cycle discovered until now. The question arises as to whether or not short-term activity cycles are a common phenomenon in F-type stars. To address this question, we analyse S-index time series of F-type stars taken with the TIGRE telescope to search for periodic variations with a maximal length of 2 years using the generalised Lomb-Scargle periodogram method. In our sample, we find four F-type stars showing periodic variations shorter than one year. However, the amplitude of these variations in our sample of F-star type stars appears to be smaller than that of solar-type stars with well-developed cyclic activity, and apparently represents only a part of the total activity. We conclude that among F-stars, the time-behaviour of activity differs from that of the Sun and cooler main sequence stars, as short-term cyclic variations with shallow amplitude of the cycle seem to prevail, rather than cycles with 10+ years periods and a larger cycle amplitude.

Abstract Copyright: © ESO 2019

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

Simbad objects: 8

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2019.09.23-16:48:32

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