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HD 190766


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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:Οκτάς
Right ascension:20h14m03.13s
Declination:-75°52'04.3"
Apparent magnitude:8.372
Distance:149.925 parsecs
Proper motion RA:25
Proper motion Dec:1.1
B-T magnitude:8.749
V-T magnitude:8.404

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 190766
TYCHO-2 2000TYC 9460-1067-1
USNO-A2.0USNO-A2 0075-06561881
HIPHIP 99716

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