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Oscillations in the PMS delta Scuti star V346 Ori
We report the discovery of periodicities in the light curve of thePre-Main Sequence (PMS) Herbig Ae star V346 Ori. We interpret variationsin the light curve of the star as the superposition of at least twoperiodic signals that result from delta Scuti-type stellaroscillations. The computation of linear non-adiabatic radial pulsationmodels for PMS stars reproduces these periods for a 1.55 Msunstar with Teff = 7410 K and log L/Lsun = 0.74pulsating in the fundamental and in the second overtone. If ourassumption of radial oscillations is indeed correct, the star's locationon the HR diagram places it at a distance significantly smaller thanthat of the Orion star forming region, hence raising questions regardingthe evolutionary status of V346 Ori. Observations with better timesampling and spanning a longer period of time are needed if the latterquestion is to be addressed fully.Tables 1 and 2 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/399/271
| 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 Meridian Proper Motions of 161 Stars in the Region of the Belt of Orion.
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