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HD 70947


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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.

The VELA star cloud. III - The B8 to A0 stars and interstellar reddening
The present discussion of intermediate band and H-beta observations of360 HD stars B8-A0 in Vela, and all of the CPD stars in a small adjacentregion, notes that the interstellar absorption in both cases can beunderstood as a combination of three absorbing clouds of 1 kpc-A(V) =1.5, 0.5, and 0.17. The major difference in the two environments is thepresence of numerous T Tauri stars in Taurus. Several clusters in theVela region are discussed.

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Observation and Astrometry data

Constellation:Achterdeck des Schiffs
Right ascension:08h23m08.24s
Declination:-40°22'51.4"
Apparent magnitude:7.587
Distance:1538.462 parsecs
Proper motion RA:-8.5
Proper motion Dec:9.5
B-T magnitude:7.475
V-T magnitude:7.578

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 70947
TYCHO-2 2000TYC 7665-2934-1
USNO-A2.0USNO-A2 0450-06679739
HIPHIP 41103

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