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HD 136223


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A revised effective-temperature calibration for the DDO photometric system
A revised effective-temperature calibration for the David DunlapObservatory (DDO) photometric system is presented. Recently publishedphotometric and spectroscopic observations of field and open-cluster Gand K stars allow a better definition of the solar-abundance fiducialrelation in the DDO C0(45-48) vs. C0(42-45)diagram. The ability of the DDO system to predict MK spectral types of Gand K giants is demonstrated. The new DDO effective temperaturecalibration reproduces satisfactorily the infrared temperature scale ofBell and Gustafsson (1989). It is shown that Osborn's (1979) calibrationunderestimates the effective temperatures of K giants by approximately170 K and those of late-type dwarfs by approximately 150 K.

A large, complete, volume-limited sample of G-type dwarfs. I. Completion of Stroemgren UVBY photometry
Four-colour photometry of potential dwarf stars of types G0 to K2,selected from the Michigan Spectral Catalogues (Vol. 1-3), has beencarried out. The results are presented in a catalogue containing 4247uvby observations of 3900 stars, all south of δ = -26deg. Theoverall internal rms errors of one observation (transformed to thestandard system) of a program star in the interval 8.5 < V < 10.5are 0.0044, 0.0021, 0.0039, and 0.0059, respectively, in V, b-y, m_1_ ,and c_1_. The purpose of the catalogue, combined with earliercatalogues, is to allow selection of a large, complete, volume-limitedsample of G- and K-type dwarfs, investigate their metallicitydistribution, and compare it to predictions of various models ofgalactic chemical evolution. Future papers in this series will discussthese subjects.

Untersuchungen an Farbenindizes II. Mit 1 Textabbildung
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Datos observacionales y astrométricos

Constelación:Lobo
Ascensión Recta:15h21m40.39s
Declinación:-53°32'27.9"
Magnitud Aparente:8.256
Distancia:226.757 parsecs
Movimiento Propio en Ascensión Recta:-67.2
Movimiento Propio en Declinación:-36
B-T magnitude:9.74
V-T magnitude:8.379

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 136223
TYCHO-2 2000TYC 8695-766-1
USNO-A2.0USNO-A2 0300-23468833
HIPHIP 75173

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