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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: | Apus |
| Right ascension: | 18h14m49.67s |
| Declination: | -78°13'41.8" |
| Apparent magnitude: | 9.262 |
| Proper motion RA: | 11.8 |
| Proper motion Dec: | 5.9 |
| B-T magnitude: | 9.704 |
| V-T magnitude: | 9.299 |
Catalogs and designations:
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