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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.

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Observation and Astrometry data

Constellation:Περσεύς
Right ascension:03h02m24.42s
Declination:+54°21'47.8"
Apparent magnitude:7.191
Distance:113.895 parsecs
Proper motion RA:19.1
Proper motion Dec:-20.8
B-T magnitude:7.512
V-T magnitude:7.218

Catalogs and designations:
Proper Names
HD 1989HD 18678
TYCHO-2 2000TYC 3701-401-1
USNO-A2.0USNO-A2 1425-04079125
HIPHIP 14147

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