Chromospheric Activity Variability in Early F-type Stars

Details Chromospheric Activity Variability in Early F-type Stars Chromospheric Activity Variability in Early F-type Stars

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.9905r&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #99.05; Bulletin of the American Astronomical Society, Vol. 30, p.1396

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Scientific paper

Using high-precision observations of the He 1 lambda 5876 (D3) line we have searched for short-term chromospheric variability in three nearby early F-type stars. In one star, 18 Bootis, we find variability at a level more than twice that of the individual measurement uncertainties, while the other two stars appear constant or only slightly variable. The variability in 18 Bootis amounts to a factor of 2 in equivalent width. During some nights the variability occurs on times scales of two hours or less, but on other nights the activity remains constant. The variability does not show any significant periodicities and does not appear to correlate with rotation. We find highly significant (P > 0.995) correlations between line width and line strength, and line center and strength. The latter correlation is in the sense of a bluer line for increasing strength, perhaps indicating increased outflow of material with increased activity.

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