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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.
| Untersuchungen an W Ursae Majoris Sternen. I. Mit 6 Textabbildungen
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| 3 W UMa-type binaries with changing periods.
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Observation and Astrometry data
| Constellation: | ケフェウス座 |
| Right ascension: | 21h03m13.32s |
| Declination: | +75°37'14.3" |
| Apparent magnitude: | 8.058 |
| Distance: | 178.253 parsecs |
| Proper motion RA: | -12.6 |
| Proper motion Dec: | -29.2 |
| B-T magnitude: | 8.412 |
| V-T magnitude: | 8.088 |
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