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HD 134898


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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.

A survey of stars with composite spectra.
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Observation and Astrometry data

Constellation:Triangle austral
Right ascension:15h16m15.55s
Declination:-67°29'04.9"
Apparent magnitude:8.4
Distance:158.73 parsecs
Proper motion RA:-21.1
Proper motion Dec:-32.4
B-T magnitude:8.924
V-T magnitude:8.444

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 134898
TYCHO-2 2000TYC 9033-128-1
USNO-A2.0USNO-A2 0225-22182120
HIPHIP 74724

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