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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.
| UZ Octantis - UBV light curves
A photometric UBV study of the W UMa system UZ Octantis is presented.Light and color curves were constructed from 1095 individualobservations on each passband made with the 1.54 m reflecting telescopeat the Bosque Alegre Station of Cordoba Observatory. A first classicalapproach to the orbital elements is given. The system is an A-type W UMastar, probably in a contact configuration.
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Группы:
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Наблюдательные данные и астрометрия
| Созвездие: | Октант |
| Прямое восхождение: | 03h39m34.24s |
| Склонение: | -85°11'40.3" |
| Видимая звёздная величина: | 8.95 |
| Расстояние: | 355.872 парсек |
| Собственное движение RA: | 2.4 |
| Собственное движение Dec: | -8.4 |
| B-T magnitude: | 10.558 |
| V-T magnitude: | 9.083 |
Каталоги и обозначения:
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