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HD 63347


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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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Dades d'Observació i Astrometria

Constel·lació:Camelopardalis
Ascensió Recta:07h54m20.48s
Declinació:+71°04'45.3"
Magnitud Aparent:7.336
Distancia:178.253 parsecs
Moviment propi RA:-34.1
Moviment propi Dec:-34.1
B-T magnitude:7.34
V-T magnitude:7.337

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 63347
TYCHO-2 2000TYC 4365-1646-1
USNO-A2.0USNO-A2 1575-02790081
HIPHIP 38608

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