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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.
| Spectral absolute magnitudes of 312 stars of the B5-A3 spectral classes in the region of the association Cygnus OB4
Observations of the region of the association Cygnus OB4 were made witha 70-cm meniscus telescope with an 8 deg objective prism and adispersion of 166 A/mm at H-gamma. The equivalent widths of the H-gammaand H-delta lines were measured and a reduction was performed withKopylov's system of equivalent widths using a number of standard stars.The absolute magnitudes of 312 stars of the B5-A3 spectral classes arederived. The positions of these stars in the H-R diagram are discussed.A table of the absolute magnitudes, spectral types, and luminosityclasses is given.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Ressam |
| Sað Açýklýk: | 05h55m43.51s |
| Yükselim: | -48°56'33.7" |
| Görünürdeki Parlaklýk: | 8.612 |
| Uzaklýk: | 384.615 parsek |
| özdevim Sað Açýklýk: | -20.6 |
| özdevim Yükselim: | 44.3 |
| B-T magnitude: | 10.25 |
| V-T magnitude: | 8.748 |
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