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HD 12335


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Photometric discriminate for GK dwarfs of disk populations
The young and old disk populations, with ages respectively less than andgreater than about 2 x 109 yr, are separated in the (R - I,42 - 45) plane, where the 42 - 45 index of the DDO system is based onbandpasses of 75 A half-width and effective wavelengths of 4257 and 4571A. A similar, but smaller separation is seen in the (g,B2 - VI) planewhere g is the Geneva system alternative to 42 - 45 but with bandpassesof 175 A half-width and effective wavelengths of 4015 and 4476 A.Although models, based on the assumption that this separation resultsfrom a veil of weak metal lines (Magain 1983), may explain thesephenomena in the (g,B2 - VI) plane for the hotter stars, more models arerequired to test it for the DDO system and for cooler objects. Theavailable evidence suggests that an additional causation, probablyconnected with the CN abundance, also exists.

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Observation and Astrometry data

Constellation:みずへび座
Right ascension:01h58m12.67s
Declination:-67°35'18.1"
Apparent magnitude:8.675
Distance:142.248 parsecs
Proper motion RA:-92.5
Proper motion Dec:-75.2
B-T magnitude:9.897
V-T magnitude:8.776

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 12335
TYCHO-2 2000TYC 9143-19-1
USNO-A2.0USNO-A2 0150-01202114
HIPHIP 9182

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