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Published June 2007 | Published
Journal Article Open

High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun


We present high-dispersion (R ~ 16,000) optical (3900-8700 Å) spectra of 390 stars obtained with the Palomar 60 inch telescope. The majority of stars observed are part of the Spitzer Legacy Science Program "The Formation and Evolution of Planetary Systems." Through detailed analysis we determine stellar properties for this sample, including radial and rotational velocities, Li I λ6708 and Hα equivalent widths, the chromospheric activity index R'_(HK), and temperature- and gravity-sensitive line ratios. Several spectroscopic binaries are also identified. From our tabulations, we illustrate basic age- and rotation-related correlations among measured indices. One novel result is that Ca II chromospheric emission appears to saturate at v sin i values above ~30 km s^(-1), similar to the well-established saturation of X-rays that originate in the spatially separate coronal region.

Additional Information

© 2007 American Astronomical Society. Print publication: Issue 6 (2007 June); received 2006 July 21; accepted for publication 2007 January 15; published 2007 April 20. We are grateful to the observing assistants formerly present at the Palomar 60 inch, Karl Dunscombe and Skip Staples, for their help and patience in acquiring this large data set. We thank E. Mamajek and C. Slesnick for assisting with the observations and Jonathan Foster, Francesca Colonnese, and Michael Inadomi for their assistance with data reduction and analysis. We appreciate greatly the scattered-light analysis provided by J.Valenti for some of our spectra. This research has made use of the SIMBAD and 2MASS databases. We acknowledge support for these observations from NASA contract 1224566 administered through JPL. This work has benefited from the ability to organize our data within the FEPS database created by John Carpenter.

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