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HD 181801


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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
The paper presents data on 1070 radial velocity measurements of starsdistributed in 39 fields measuring 4 deg x 4 deg. The PPO series ofFehrenbach et al. (1987) and Duflot et al. (1990) is continued using theFehrenbach objective prism method.

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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Osservazione e dati astrometrici

Costellazione:Aquila
Ascensione retta:19h21m17.60s
Declinazione:+14°38'01.3"
Magnitudine apparente:7.664
Distanza:298.507 parsec
Moto proprio RA:1.2
Moto proprio Dec:-8.4
B-T magnitude:7.658
V-T magnitude:7.664

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 181801
TYCHO-2 2000TYC 1054-951-1
USNO-A2.0USNO-A2 0975-14619451
HIPHIP 95132

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