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Asymptotic giant branch stars near the sun
Available red and near-infrared photometry and apparent motions of M, S,and C asymptotic giant branch (AGB) stars in the Bright Star Catalogueare tabulated and discussed. It is shown that the red and near infraredindices normally used for late-type stars are interchangeable except forcarbon stars. The M-type giants are variable with visual amplitudegreater than 0.05 mag. The reddening-free parameter m2 from Genevaphotometry is essentially a temperature parameter for M giants, whilethe reddening-free parameter d is a sensitive detector of blue stellarcompanions. The space density of AGB stars near the sun decreases by afactor of 35 in a temperature range 3800 to 3400 K. Two of the S starsnear the sun were found to have nearly equal space motions and may becomembers of the Arcturus group.
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Osservazione e dati astrometrici
| Costellazione: | Triangolo |
| Ascensione retta: | 01h36m38.50s |
| Declinazione: | +29°26'02.1" |
| Magnitudine apparente: | 8.211 |
| Moto proprio RA: | 28.5 |
| Moto proprio Dec: | -63.9 |
| B-T magnitude: | 9.928 |
| V-T magnitude: | 8.353 |
Cataloghi e designazioni:
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