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HD 104940


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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 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Buyuk Ayi
Sað Açýklýk:12h04m59.83s
Yükselim:+50°17'01.4"
Görünürdeki Parlaklýk:8.274
Uzaklýk:323.625 parsek
özdevim Sað Açýklýk:-35.4
özdevim Yükselim:-0.6
B-T magnitude:10.283
V-T magnitude:8.44

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 104940
TYCHO-2 2000TYC 3457-96-1
USNO-A2.0USNO-A2 1350-08054824
HIPHIP 58927

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