Measurements of Activity and Rotation Periods in The California & Carnegie Planet Search Program Stars

Details Measurements of Activity and Rotation Periods in The California & Carnegie Planet Search Program Stars Measurements of Activity and Rotation Periods in The California & Carnegie Planet Search Program Stars

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.2107w&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #21.07; Bulletin of the American Astronomical Society, Vol. 34, p.1139

Astronomy and Astrophysics

Astronomy

Scientific paper

The California & Carnegie Planet Search has been regularly observing several hundred late-type main-sequence stars at high spectral resolution as part of its ongoing survey to find extrasolar planets. One of the largest sources of error in the measured velocity is that due to "photoshperic 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 in the program provides a measurement of the strength of the stellar Calcium H & K lines. These measurements are a standard metric of stellar activity which can provide an estimate of the photospheric jitter and rotation period of the star, both critical vaues in the search for extrasolar planets. Here we present Mt. Wilson S values and variability, RHK, and rotation periods for our project stars based on our Lick and Keck spectra. This work was funded by the NASA Origins Program and an NSF Graduate Research Fellowship.

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