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HD 187539


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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.

UBV photometry of HD stars in the fields of selected cataclysmic variables.
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观测天体数据

星座:人馬座
右阿森松:19h52m20.71s
赤纬:-42°37'22.1"
视星:8.981
距离:143.885 天文距离
右阿森松适当运动:22.2
赤纬适当运动:-19
B-T magnitude:10.069
V-T magnitude:9.071

目录:
适当名称
HD 1989HD 187539
TYCHO-2 2000TYC 7942-124-1
USNO-A2.0USNO-A2 0450-38258479
HIPHIP 97793

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