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HD 239700


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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.

Determination of size, color indices, and spectral classes of stars in an area centered on R.A.=21h24m, Dec=+58.5deg.
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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Kral-Sefe
Sað Açýklýk:21h33m57.13s
Yükselim:+60°29'24.7"
Görünürdeki Parlaklýk:8.815
Uzaklýk:1492.537 parsek
özdevim Sað Açýklýk:1
özdevim Yükselim:-3
B-T magnitude:9.174
V-T magnitude:8.845

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 239700
TYCHO-2 2000TYC 4249-280-1
USNO-A2.0USNO-A2 1500-08154594
HIPHIP 106479

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