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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. Themajority of stars observed are part of the Spitzer Legacy ScienceProgram ``The Formation and Evolution of Planetary Systems.'' Throughdetailed analysis we determine stellar properties for this sample,including radial and rotational velocities, Li I λ6708 andHα equivalent widths, the chromospheric activity indexR'HK, and temperature- and gravity-sensitive lineratios. Several spectroscopic binaries are also identified. From ourtabulations, we illustrate basic age- and rotation-related correlationsamong measured indices. One novel result is that Ca II chromosphericemission appears to saturate at vsini values above ~30 kms-1, similar to the well-established saturation of X-raysthat originate in the spatially separate coronal region.
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| Сазвежђа: | Цефеј |
| Ректацензија: | 01h49m36.88s |
| Deклинација: | +78°16'13.2" |
| Apparent магнитуда: | 9.388 |
| Proper motion RA: | 34.4 |
| Proper motion Dec: | -3.5 |
| B-T magnitude: | 9.84 |
| V-T magnitude: | 9.426 |
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