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HD 57764


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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.

SAO stars with infrared excess in the IRAS Point Source Catalog
We have undertaken a search for SAO stars with infrared excess in theIRAS Point Source Catalog. In contrast to previous searches, the entireIRAS (12)-(25)-(60) color-color diagram was used. This selection yieldeda sample of 462 stars, of which a significant number are stars withcircumstellar material. The stars selected can be identified aspre-main-sequence stars, Be stars, protoplanetary systems, post-AGBstars, etc. A number of objects are (visual) binary stars.Characteristic temperatures and IR excesses are calculated and theirrelations to spectral type are investigated.

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Osservazione e dati astrometrici

Costellazione:Carena
Ascensione retta:07h19m51.73s
Declinazione:-52°33'54.0"
Magnitudine apparente:7.434
Distanza:247.525 parsec
Moto proprio RA:6.1
Moto proprio Dec:10.2
B-T magnitude:8.756
V-T magnitude:7.544

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 57764
TYCHO-2 2000TYC 8550-434-1
USNO-A2.0USNO-A2 0300-02825029
HIPHIP 35515

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