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J. T. Wright, G. W. Marcy, D. A. Fischer (UC Berkeley), R. P. Butler (Carnegie Inst. of Washington, DTM)
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, R/HK, 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.
The author(s) of this abstract have provided an email address for comments about the abstract: jtwright@astro.berkeley.edu
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.