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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. V - Ground support of the HIPPARCOS satellite observation program
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| Optical observations of ultraviolet objects. II - Classification and photometry /l = 0 to 145 deg/
UBV photometry and MK spectral classification are presented for a sampleof stars originally selected as UV objects from satellite photometrywith the S2/68 experiment. Although most stars of the sample arespectroscopically normal, a number of hot, subluminous stars were alsofound. Radial velocities are given for some of the stars observed. It isproposed that the majority of the apparently normal early B stars athigh galactic latitudes which are not runaway stars are subluminousdisc-population analogues of horizontal branch B stars of Population II.
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Datos observacionales y astrométricos
| Constelación: | Águila |
| Ascensión Recta: | 19h21m17.60s |
| Declinación: | +14°38'01.3" |
| Magnitud Aparente: | 7.664 |
| Distancia: | 298.507 parsecs |
| Movimiento Propio en Ascensión Recta: | 1.2 |
| Movimiento Propio en Declinación: | -8.4 |
| B-T magnitude: | 7.658 |
| V-T magnitude: | 7.664 |
Catálogos y designaciones:
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