Other
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..459r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 459-472.
Other
187
Late Stars, Main Sequence Stars, Stellar Activity, Stellar Rotation, Variable Stars, Calcium, Emission Spectra, Potassium, Stellar Spectra, Stellar Spectrophotometry
Scientific paper
High-precision differential b, y photometric observations of 24 Hyades stars, spectral types F4 V to K8 V, were made at Lowell Observatory during late 1983 and early 1984. It was found that all 18 stars of spectral type F8 V or later in this sample were variable, confirming that low-level photometric variability is a ubiquitous and persistent characteristic of Hyades stars later than spectral type F8 V. On the other hand, the six stars earlier than spectral type F7 V were not detectably variable. Contemporaneous Ca II H + K emission flux measurements for five of the 24 stars, spectral types F8 V to G2 V, were obtained at Mount Wilson Observatory and showed that H + K emission flux varies inversely with respect to photometric brightness on both long-term and rotational time scales. Rotation periods were measured for a total of 23 Hyades stars ranging in spectral type from F8 V to K8 V. It was found that Hyades stars conform reasonably well to the 'Rossby relation', which relates chromospheric activity to the ratio of rotation period and convective turnover time scale.
Baggett Wayne E.
Duncan Douglas K.
Lockwood Wesley G.
Radick Richard R.
Thompson Don T.
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