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HD 199740


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New periodic variables from the Hipparcos epoch photometry
Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.

Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry
Within the framework of a large photometric observing program, designedto investigate the Galaxy's structure and evolution, Hβ photometryis being made for about 9000 stars. As a by-product, supplementary uvbyphotometry has been made. The results are presented in a cataloguecontaining 6924 uvby observations of 6190 stars, all south ofδ=+38deg. The overall internal rms errors of one observation(transformed to the standard system) of a program star in the interval6.5

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Osservazione e dati astrometrici

Costellazione:Volpetta
Ascensione retta:20h58m28.17s
Declinazione:+23°14'51.0"
Magnitudine apparente:8.082
Distanza:102.881 parsec
Moto proprio RA:29.8
Moto proprio Dec:4.8
B-T magnitude:8.463
V-T magnitude:8.114

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 199740
TYCHO-2 2000TYC 2172-604-1
USNO-A2.0USNO-A2 1125-17548373
HIPHIP 103529

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