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HD 225114


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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.

Miscellaneous spectroscopic notes
Results of slit-spectrograph observations are reported for approximately260 stars. The data presented range from recognition of many new Ap, Am,and other unusual stars to H-alpha observations of early-typesupergiants and Be stars. The material discussed was obtained over thepast 40 years at a number of U.S. observatories and at the DominionAstrophysical Observatory in Victoria, B.C.

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Osservazione e dati astrometrici

Costellazione:Cefeo
Ascensione retta:00h03m38.11s
Declinazione:+70°18'21.7"
Magnitudine apparente:8.096
Distanza:342.466 parsec
Moto proprio RA:9.6
Moto proprio Dec:-0.5
B-T magnitude:8.078
V-T magnitude:8.095

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 225114
TYCHO-2 2000TYC 4298-755-1
USNO-A2.0USNO-A2 1575-00035085
HIPHIP 292

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