Other
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..204s&link_type=abstract
NOAO Proposal ID #1999B-0204
Other
Scientific paper
This program will complete a survey of activity in ~5,000 solar- type stars within 60 pc. By ``solar-type'' we mean about F8V to K2V. Activity will be determined from the residual flux in the cores of the Ca II H and K lines. We have already completed a survey for solar-type stars below -26° at CTIO, and another 2,000+ stars at KPNO in semesters 1998B and 1999A in the first phase of this survey. This survey has three purposes. In and of itself the survey identifies interesting stars worthy of further study. For example, our southern survey found a number of highly active stars, and we have found more in the north. Some of these are genuinely young, single stars that are pre-main sequence objects which have no relationship to any known region of star formation. We also found many stars with much less than solar-level activity, stars that could be a in a Maunder-minimum-like phase. A second purpose of the survey is to improve the statistical context of solar and stellar activity. The distribution of activity tells us a lot about the nature and evolution of that fundamental property of solar-type stars. Finally, the survey will provide basic information to characterize these stars as targets for other programs such as the Space Interferometry Mission and the Terrestrial Planet Finder.
David Soderblom R.
King Jeremy R.
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