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HD 27994


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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:Caelum
Right ascension:04h23m21.83s
Declination:-41°14'54.7"
Apparent magnitude:8.778
Distance:374.532 parsecs
Proper motion RA:4.7
Proper motion Dec:3
B-T magnitude:10.857
V-T magnitude:8.95

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 27994
TYCHO-2 2000TYC 7581-1296-1
USNO-A2.0USNO-A2 0450-01507594
HIPHIP 20479

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