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HD 107250


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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.

Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

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Osservazione e dati astrometrici

Costellazione:Croce del Sud
Ascensione retta:12h20m06.28s
Declinazione:-56°43'03.2"
Magnitudine apparente:7.868
Distanza:490.196 parsec
Moto proprio RA:-16.1
Moto proprio Dec:-3.8
B-T magnitude:7.873
V-T magnitude:7.869

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 107250
TYCHO-2 2000TYC 8641-215-1
USNO-A2.0USNO-A2 0300-15379044
HIPHIP 60153

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