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HD 42967


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Inaccuracies in the spectral classification of stars from the Tycho-2 Spectral Type Catalogue
We compare the spectroscopic and trigonometric parallaxes of commonstars from the Tycho-2 Spectral Type and Hipparcos Catalogues. Thiscomparison has revealed that the distance estimations for theoverwhelming majority of stars by both methods yield very similarresults. However, there is a small fraction of stars for which thedistance estimates differ significantly. It is these stars that are thesubject of our study. We have been able to find the causes of thesedifferences.

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:Buyuk Kopek
Sað Açýklýk:06h12m26.82s
Yükselim:-29°27'26.2"
Görünürdeki Parlaklýk:8.921
Uzaklýk:354.61 parsek
özdevim Sað Açýklýk:-5.6
özdevim Yükselim:-0.2
B-T magnitude:10.708
V-T magnitude:9.069

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 42967
TYCHO-2 2000TYC 6517-1925-1
USNO-A2.0USNO-A2 0600-03075278
HIPHIP 29458

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