Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18710307r&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #103.07; Bulletin of the American Astronomical Society, Vol. 27, p.1431
Astronomy and Astrophysics
Astronomy
Scientific paper
We have analyzed published UBV photometry of the main sequences of a sample of nearby open clusters, and find a significant low number density area (``gap") in the distribution at B-V=0.30. This corresponds to a previously observed gap in field stars near B-V=0.26. These B-V values correspond to spectral type F0, which is near the expected boundary between radiative atmospheres and convective atmospheres. Preliminary results are given of a survey of chromospheric activity in late A- and early F-type stars in open clusters using the He I lambda 5876 (D3) absorption feature. These results indicate that the observed gap is at least an indirect consequence of the onset of convective energy transport. This research was supported in part by the Wyoming Planetary and Space Science Center, NASA Grant #NGT-40050.
Canterna Ron W.
Rachford Brian Lee
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