Computer Science
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...76s&link_type=abstract
NOAO Proposal ID #2000B-0076
Computer Science
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 (the sample is defined by B-V colors from Hipparcos). Activity is measured from the cores of the Ca II H and K lines. We have already observed ~3,000 stars above -40° declination at Kitt Peak and about 800 stars below -26° in an earlier effort at CTIO. This proposal is for mop-up in the northern portions, and for the first semester for southern stars using the Hipparcos-defined sample (the earlier sample was less well defined and not volume-limited, although portions of it are still valid). This survey has three purposes. First, we identify interesting (i.e., highly active) stars worthy of further study. Some of these turn out to be pre-main sequence stars which are not associated with known regions of star formation, and their existence is difficult to explain. Second, we provide an extensive context into which to place solar and stellar activity in a statistical sense. Finally, the survey will provide metallicities of good systematic quality for studying properties of our Galactic neighborhood. The information we produce will become part of an effort to fully characterize the nearby stars.
David Soderblom R.
Henry Todd J.
King Jeremy R.
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