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HD 108689


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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.

Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.

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Observation and Astrometry data

Constellation:Croix du Sud
Right ascension:12h29m33.62s
Declination:-59°05'07.8"
Apparent magnitude:7.574
Distance:3333.333 parsecs
Proper motion RA:-4.6
Proper motion Dec:0
B-T magnitude:8.089
V-T magnitude:7.617

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 108689
TYCHO-2 2000TYC 8658-1975-1
USNO-A2.0USNO-A2 0300-15836175
HIPHIP 60947

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