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The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
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A grid of metal-weak spectral-classification standards is used tosystematically extend the MK spectral-classification system to F-typestars of the intermediate population II. The present method allowsmetal-weak program stars to be compared with standards of similarmetallicity and effective temperature. The results demonstrate that theintermediate population II is very homogeneous. Excellent agreement isobtained between the classifications of the present extended system anduvby-beta photometric results.
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Osservazione e dati astrometrici
| Costellazione: | Poppa |
| Ascensione retta: | 08h08m08.02s |
| Declinazione: | -36°25'06.3" |
| Magnitudine apparente: | 7.751 |
| Distanza: | 89.847 parsec |
| Moto proprio RA: | -50.6 |
| Moto proprio Dec: | 33.4 |
| B-T magnitude: | 8.055 |
| V-T magnitude: | 7.777 |
Cataloghi e designazioni:
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