Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..476b&link_type=abstract
NOAO Proposal ID #2008A-0476
Astronomy and Astrophysics
Astronomy
Scientific paper
Cool stars spin down over time. This spindown is simultaneously impressively regular, surprisingly complex, scientifically intriguing, and its study even useful to other branches of astronomy. Some of this beautiful complexity is encapsulated in a new theory of stellar rotation, called `CgI.' We propose here to explore, develop, and test this theory using rotation period data in two carefully chosen Southern open clusters. The proposed data will constitute the definitive rotational study of the selected clusters for some time to come, because of the period- and amplitude sensitivity, the large number of periods, and the multiplexing effects of associated data. Furthermore, the data have a usefulness that transcends any theory. They will allow the empirical determination of the (apparently universal) mass dependence of stellar rotation, several timescales important to rotational spindown, the full interpretation of extant and allocated X-ray spectroscopy of the proposed cluster stars, a deep BVI Color-Magnitude Diagram of the proposed clusters, a make-or-break test of the CgI scenario, and the exploration of connections with multiplicity (in concert with separately proposed observations).
Barnes Sydney A.
Meibom Soeren
Saar Steven
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