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HD 152493


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The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.

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.

Catalogue et bibliographie des étoiles A à spectre particulier - Deuxième supplément
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Catalogue et bibliographie des étoiles A à spectre particulier
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Observation and Astrometry data

Constellation:Triangle austral
Right ascension:16h58m15.50s
Declination:-65°12'16.4"
Apparent magnitude:6.525
Distance:123.457 parsecs
Proper motion RA:-12.5
Proper motion Dec:-53.1
B-T magnitude:6.929
V-T magnitude:6.559

Catalogs and designations:
Proper Names
HD 1989HD 152493
TYCHO-2 2000TYC 9047-1572-1
USNO-A2.0USNO-A2 0225-26635924
HIPHIP 83053
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