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HD 165093


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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:
Proper Names   (Edit)
HD 1989HD 165093
TYCHO-2 2000TYC 9449-1850-1
USNO-A2.0USNO-A2 0075-06058650
HIPHIP 89417

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