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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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Buyuk Kopek |
| Sað Açýklýk: | 06h26m09.36s |
| Yükselim: | -15°07'12.4" |
| Görünürdeki Parlaklýk: | 8.886 |
| Uzaklýk: | 1369.863 parsek |
| özdevim Sað Açýklýk: | -1.2 |
| özdevim Yükselim: | 1.1 |
| B-T magnitude: | 8.914 |
| V-T magnitude: | 8.889 |
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