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Ca II H and K filter photometry on the UVBY system. I - The standard system
A fifth filter (fwhm = 90 A) centered on Ca II H and K has beendeveloped for use with the standard uvby system. The filter, called Ca,is designed primarily for applications to metal-poor dwarfs and redgiants, regions where the uvby metallicity index, m(l), loses somesensitivity. An index, hk, is defined by replacing v in m(l) by Ca. Theeffects of interstellar extinction on the index are modeled anddemonstrated to be modest and relatively insensitive to spectral type.Observations of V, (b-y), and hk for 163 primary standards are detailedand transformed to the standard V and (b-y) system. A qualitativeanalysis using only the primary standards indicates that hk is moresensitive than m(l) over the regions of interest by about a factor of 3.
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Observation and Astrometry data
| Constellation: | Equuleus |
| Right ascension: | 21h12m16.96s |
| Declination: | +05°48'11.5" |
| Apparent magnitude: | 8.63 |
| Proper motion RA: | -3.6 |
| Proper motion Dec: | -4.5 |
| B-T magnitude: | 10.7 |
| V-T magnitude: | 8.801 |
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