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UvbyHbeta_ photometry of main sequence A type stars.
We present Stroemgren uvby and Hbeta_ photometry for a set of575 northern main sequence A type stars, most of them belonging to theHipparcos Input Catalogue, with V from 5mag to 10mag and with knownradial velocities. These observations enlarge the catalogue we began tocompile some years ago to more than 1500 stars. Our catalogue includeskinematic and astrophysical data for each star. Our future goal is toperform an accurate analysis of the kinematical behaviour of these starsin the solar neighbourhood.
| Radial velocity measurements. IV - Ground-based accompaniment to the HIPPARCOS observation program
The paper presents 396 radial velocities of stars distributed in 19fields of 4 x 4 degrees. The study employs the Fehrenbach objectiveprism method and the same measuring technique used in a previous paper(Fehrenbach et al., 1987).
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Посматрања и Астрометриски подаци
| Сазвежђа: | Змај |
| Ректацензија: | 20h06m46.25s |
| Deклинација: | +63°42'24.4" |
| Apparent магнитуда: | 7.638 |
| Даљина: | 370.37 parsecs |
| Proper motion RA: | -3.3 |
| Proper motion Dec: | -11.9 |
| B-T magnitude: | 7.641 |
| V-T magnitude: | 7.639 |
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