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HD 177609


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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:Sagittaire
Right ascension:19h06m21.79s
Declination:-22°36'01.1"
Apparent magnitude:8.512
Distance:228.311 parsecs
Proper motion RA:40
Proper motion Dec:-20.7
B-T magnitude:9.959
V-T magnitude:8.632

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 177609
TYCHO-2 2000TYC 6873-48-1
USNO-A2.0USNO-A2 0600-39058953
HIPHIP 93819

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