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Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry
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| Uvby-beta photometry of stars in the Michigan Spectral Catalogue. I - The Delta Del stars
uvby-beta photometry of 74 stars classified as Delta Del in Volume 1 ofthe Michigan Spectral Catalogue is presented. The photometry is inagreement with the spectral classification in that it indicates DeltaDel stars are metal-line-enhanced stars with equivalent-temperaturetypes of A9 + or - 2 subtypes. There is a discrepancy between theluminosity implied from the delta c1 index and the spectralclassification. It is argued that c1 is an inadequateluminosity indicator for some late A- to early F-type stars. Several ofthe Delta Del stars are known Delta Scuti pulsators, and some commentson the metallicism-pulsation relation are made.
| Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
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Datos observacionales y astrométricos
| Constelación: | Ave del Paraíso |
| Ascensión Recta: | 15h59m50.65s |
| Declinación: | -80°10'40.9" |
| Magnitud Aparente: | 8.519 |
| Distancia: | 233.645 parsecs |
| Movimiento Propio en Ascensión Recta: | 12.4 |
| Movimiento Propio en Declinación: | -4.6 |
| B-T magnitude: | 9.046 |
| V-T magnitude: | 8.563 |
Catálogos y designaciones:
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