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HD 18678


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Estimation of stellar metal abundance. I - Calibration of the CA II K index
A method for estimating the stellar metal abundances is proposed whichcompares measures of the equivalent width of a single feature inmoderate resolution (1 A) optical spectra of stars, the Ca II K line at3933 A, with models of the predicted line strength as a function of thebroadband B-V color and Fe/H. The approach is capable of providingestimates of stellar metallicity over the range -4.5 to -1.0 with ascatter of about 0.15 dex for dwarfs and giants in the color range0.33-0.85. For cooler stars, with B-V in the range 0.85-1.1, the scattermay be as large as 0.19 dex. The calibration of the Ca II K index withFe/H is discussed, and average radial velocities and abundances arepresented for several galactic globular clusters.

Errata in Magnitudes of Stars in AGK3
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观测天体数据

星座:英仙座
右阿森松:03h02m24.42s
赤纬:+54°21'47.8"
视星:7.191
距离:113.895 天文距离
右阿森松适当运动:19.1
赤纬适当运动:-20.8
B-T magnitude:7.512
V-T magnitude:7.218

目录:
适当名称
HD 1989HD 18678
TYCHO-2 2000TYC 3701-401-1
USNO-A2.0USNO-A2 1425-04079125
HIPHIP 14147

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