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HD 205370


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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:インディアン座
Right ascension:21h36m31.43s
Declination:-54°11'28.0"
Apparent magnitude:8.641
Distance:444.444 parsecs
Proper motion RA:-9.7
Proper motion Dec:-1.6
B-T magnitude:9.068
V-T magnitude:8.677

Catalogs and designations:
Proper Names
HD 1989HD 205370
TYCHO-2 2000TYC 8807-892-1
USNO-A2.0USNO-A2 0300-37275493
HIPHIP 106683

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