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HD 27240


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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.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Irmak
Sað Açýklýk:04h16m36.65s
Yükselim:-36°39'19.7"
Görünürdeki Parlaklýk:9.252
özdevim Sað Açýklýk:-8.8
özdevim Yükselim:-30.5
B-T magnitude:10.277
V-T magnitude:9.337

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 27240
TYCHO-2 2000TYC 7043-688-1
USNO-A2.0USNO-A2 0525-01530927
HIPHIP 19939

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