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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.
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Observation and Astrometry data
| Constellation: | Inder |
| Right ascension: | 21h36m31.43s |
| Declination: | -54°11'28.0" |
| Apparent magnitude: | 8.641 |
| Distance: | 444.444 parsecs |
| Proper motion RA: | -9.7 |
| Proper motion Dec: | -1.6 |
| B-T magnitude: | 9.068 |
| V-T magnitude: | 8.677 |
Catalogs and designations:
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