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HD 168983


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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:Ταώς
Right ascension:18h26m35.38s
Declination:-61°39'37.6"
Apparent magnitude:7.854
Distance:212.314 parsecs
Proper motion RA:5.3
Proper motion Dec:-30.8
B-T magnitude:8.33
V-T magnitude:7.894

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 168983
TYCHO-2 2000TYC 9068-1365-1
USNO-A2.0USNO-A2 0225-29190132
HIPHIP 90387

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