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HD 122096


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Three colour observations of southern red variable giant stars
UBV observations have been made of southern red variables of varioustypes over a period of two years. Accurate light curves of about 35variables have been obtained; in many cases the observations coveredmore than one cycle. It appears that the M-type SRb and Lb variablesdefine a curved strip in the (B-V)-(U-B) plane. The mean (U-B) of thevariable stars is about 0.5 mag bluer than the (U-B) of the nonvariableK-type giants. The red variables may be divided into different groups:the carbon stars and the M-type variables, of which the M-type stars areagain to be divided into three groups on the basis of their colorvariations and consequently their loops in the two-color plane.

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Observation and Astrometry data

Constellation:Centaurus
Right ascension:14h01m18.39s
Declination:-57°13'43.2"
Apparent magnitude:7.041
Distance:1234.568 parsecs
Proper motion RA:-5.5
Proper motion Dec:-2.2
B-T magnitude:9.39
V-T magnitude:7.235

Catalogs and designations:
Proper Names
HD 1989HD 122096
TYCHO-2 2000TYC 8673-11-1
USNO-A2.0USNO-A2 0300-20098905
HIPHIP 68491

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