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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.

Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

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Dades d'Observació i Astrometria

Constel·lació:Scorpius
Ascensió Recta:16h34m21.42s
Declinació:-33°17'41.6"
Magnitud Aparent:8.833
Distancia:151.976 parsecs
Moviment propi RA:-35.5
Moviment propi Dec:-60.6
B-T magnitude:9.853
V-T magnitude:8.918

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 149171
TYCHO-2 2000TYC 7349-2066-1
USNO-A2.0USNO-A2 0525-23230002
HIPHIP 81143

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