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HD 9255


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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:Eridanus
Right ascension:01h29m51.80s
Declination:-54°09'22.8"
Apparent magnitude:9.197
Proper motion RA:12.3
Proper motion Dec:4
B-T magnitude:9.693
V-T magnitude:9.238

Catalogs and designations:
Proper Names
HD 1989HD 9255
TYCHO-2 2000TYC 8475-981-1
USNO-A2.0USNO-A2 0300-00453924
HIPHIP 6980

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