Measurements of Activity in 1000 Planet Search Stars

Details Measurements of Activity in 1000 Planet Search Stars Measurements of Activity in 1000 Planet Search Stars

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.3207w&link_type=abstract

American Astronomical Society Meeting 202, #32.07; Bulletin of the American Astronomical Society, Vol. 35, p.744

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The California & Carnegie Planet Search Program has been regularly observing several hundred late-type main-sequence stars at high spectral resolution as the core of its ongoing survey of bright stars to find extrasolar planets through precision radial velocity measurements. One source of error in the measured velocities is that due to ``photospheric jitter'': flows and inhomogeneities on the stellar surface can produce variations in the measured radial velocity of a star and can even mimic the signature of planetary companions. Fortunately, in addition to providing a precision radial velocity, each observation provides a measurement of the strength of the stellar chromospheric Calcium II H & K emission cores. These measurements are a standard metric of stellar activity which can provide an estimate of the photospheric jitter and rotation period of a star, both critical values for understanding and interpreting the noise present in radial velocity measurements. Here, we present our calculated activity levels, expressed as Mt. Wilson S values, and derived rotation periods for about 1000 stars in the planet search program from the Keck telescope.

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