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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: | Idra |
| Ascensione retta: | 08h38m25.63s |
| Declinazione: | -17°00'13.5" |
| Magnitudine apparente: | 8.632 |
| Distanza: | 371.747 parsec |
| Moto proprio RA: | -10.3 |
| Moto proprio Dec: | 2 |
| B-T magnitude: | 9.708 |
| V-T magnitude: | 8.721 |
Cataloghi e designazioni:
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