Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.8011r&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #80.11; Bulletin of the American Astronomical Society, Vol. 29, p.1339
Astronomy and Astrophysics
Astronomy
Scientific paper
We report observations of the chromospheric He I lambda 5876 (D3) line in the late A- and F-type stars in the Hyades, Praesepe, and Coma star clusters. The average chromospheric activity level in the early F-type stars is statistically identical in the three clusters and in field dwarfs. In contrast, the coronal X-ray emission of early F-stars is considerably smaller for Praesepe as compared to Hyades and Coma. In later F-type stars, D3 is slightly weaker in the Hyades as compared with Coma, consistant with the well-known decrease in activity with age observed in solar-type stars. The earliest star detected in each cluster ranges from \bv\ = 0.26 in the Hyades to 0.31 in Praesepe. However, four stars in the Hyades in the range 0.28--0.32 are not detected. Finally, in nine early F-type stars we compare D3 strength in two different observing runs to investigate variability.
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