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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.
| Population studies. IV - The Rose 'red horizontal branch' candidates as probes of the thick disk
DDO observations are reported for 10 of the Upgren (1962) red giantswhich Rose (1985) has identified as red horizontal branch (RHB) stars ofa globular cluster type population in the Gilmore-Reid thick disk. It isshown here that, while in the final analysis Rose's hypothesis may becorrect, it is not unique, and that his RHB candidates have all thecharacteristics of clump stars in the old, metal-deficient, open clusterNGC 2243. The only way to test Rose's hypothesis in an unambiguous wayis to analyze a complete sample of stars having colors in the range B-Vbetween 0.7 and 0.95, rather than one chosen by spectral-type criteria.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Terazi |
| Sað Açýklýk: | 15h13m39.78s |
| Yükselim: | -29°45'26.2" |
| Görünürdeki Parlaklýk: | 8.56 |
| Uzaklýk: | 168.919 parsek |
| özdevim Sað Açýklýk: | 9.1 |
| özdevim Yükselim: | 33.5 |
| B-T magnitude: | 9.912 |
| V-T magnitude: | 8.672 |
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