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TYC 7257-487-3


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Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample
We are obtaining spectra, spectral types, and basic physical parametersfor the nearly 3600 dwarf and giant stars earlier than M0 in theHipparcos catalog within 40 pc of the Sun. Here we report on resultsfor 1676 stars in the southern hemisphere observed at Cerro TololoInter-American Observatory and Steward Observatory. These resultsinclude new, precise, homogeneous spectral types, basic physicalparameters (including the effective temperature, surface gravity, andmetallicity [M/H]), and measures of the chromospheric activity of ourprogram stars. We include notes on astrophysically interesting stars inthis sample, the metallicity distribution of the solar neighborhood, anda table of solar analogs. We also demonstrate that the bimodal nature ofthe distribution of the chromospheric activity parameterlogR'HK depends strongly on the metallicity, andwe explore the nature of the ``low-metallicity'' chromosphericallyactive K-type dwarfs.

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观测天体数据

星座:半人馬座
右阿森松:13h00m49.95s
赤纬:-35°22'17.9"
视星:11.338
距离:30.139 天文距离
右阿森松适当运动:-116.7
赤纬适当运动:4.7
B-T magnitude:13.019
V-T magnitude:11.477

目录:
适当名称   (Edit)
TYCHO-2 2000TYC 7257-487-3
USNO-A2.0USNO-A2 0525-15677003
HIPHIP 63512

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