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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.
| The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Pergel |
| Sað Açýklýk: | 14h29m38.00s |
| Yükselim: | -66°24'42.3" |
| Görünürdeki Parlaklýk: | 9.009 |
| Uzaklýk: | 170.068 parsek |
| özdevim Sað Açýklýk: | -48 |
| özdevim Yükselim: | -31.4 |
| B-T magnitude: | 9.366 |
| V-T magnitude: | 9.039 |
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