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HD 26897


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Multiperiodicities from the Hipparcos epoch photometry and possible pulsation in early A-type stars
A selection criterion based on the relative strength of the largestpeaks in the amplitude spectra, and an information criterion are used incombination to search for multiperiodicities in Hipparcos epochphotometry. The method is applied to all stars which have beenclassified as variable in the Hipparcos catalogue: periodic, unsolvedand microvariables. Results are assessed critically: although there aremany problems arising from aliasing, there are also a number ofinteresting frequency combinations which deserve further investigation.One such result is the possible occurrence of multiple periods of theorder of a day in a few early A-type stars. The Hipparcos catalogue alsocontains a number of these stars with single periodicities: such starswith no obvious variability classifications are listed, and informationabout their properties (e.g., radial velocity variations) discussed.These stars may constitute a new class of pulsators.

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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Osservazione e dati astrometrici

Costellazione:Perseo
Ascensione retta:04h17m16.89s
Declinazione:+46°41'48.1"
Magnitudine apparente:7.383
Distanza:653.595 parsec
Moto proprio RA:4.7
Moto proprio Dec:-4.1
B-T magnitude:9.455
V-T magnitude:7.555

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 26897
TYCHO-2 2000TYC 3328-2017-1
USNO-A2.0USNO-A2 1350-04416366
HIPHIP 19992

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