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HD 174591


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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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Osservazione e dati astrometrici

Costellazione:Sagittario
Ascensione retta:18h51m50.79s
Declinazione:-16°30'37.7"
Magnitudine apparente:8.579
Distanza:248.756 parsec
Moto proprio RA:14.4
Moto proprio Dec:1.4
B-T magnitude:9.931
V-T magnitude:8.691

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 174591
TYCHO-2 2000TYC 6281-1421-1
USNO-A2.0USNO-A2 0675-30259447
HIPHIP 92572

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