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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: | Persée |
| 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 |
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