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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.
| Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
| The Intermediate-Age Cluster IC 4651
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971ApJ...166...87E&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Altare |
| Ascensione retta: | 17h25m58.88s |
| Declinazione: | -49°44'05.7" |
| Magnitudine apparente: | 6.899 |
| Distanza: | 645.161 parsec |
| Moto proprio RA: | -0.1 |
| Moto proprio Dec: | -5.2 |
| B-T magnitude: | 6.805 |
| V-T magnitude: | 6.892 |
Cataloghi e designazioni:
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