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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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Datos observacionales y astrométricos
Constelación: | Osa Mayor |
Ascensión Recta: | 09h36m03.37s |
Declinación: | +53°17'37.4" |
Magnitud Aparente: | 10.384 |
Movimiento Propio en Ascensión Recta: | -15.2 |
Movimiento Propio en Declinación: | 9.3 |
B-T magnitude: | 11.215 |
V-T magnitude: | 10.453 |
Catálogos y designaciones:
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