Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340807i&link_type=abstract
American Astronomical Society, AAS Meeting #213, #408.07; Bulletin of the American Astronomical Society, Vol. 41, p.206
Astronomy and Astrophysics
Astronomy
4
Scientific paper
We present the stellar chromospheric activity measurements of 2000 F, G, K and M type stars. Observations of high resolution spectra were collected from August 2004 to the present at the Lick and Keck Observatories as part of the California Planet Search program. The Keck observations were taken after the CCD upgrade on HIRES in August 2004. Measurements of emission flux in the cores of the Calcium H and K absorption lines are converted to the standard metric of S-values as established by Mt. Wilson observatory. In addition to time series S-values, we include values found directly from the S-value including stellar rotation period, and age. An activity thresh hold has been established which establishes a limit to our ability to detect planets as a function of activity. This threshold defines the level of jitter in a star.
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