POLARIMETRIC OBSERVATIONS OF SOUTHERN-HEMISPHERE YOUNG SOLAR-TYPE STARS

A report is given on some linear and circular polarimetric observation s of young solar-type stars. Despite a somewhat high level of instrume ntal polarization, the measurements: were able to detect polarizations similar to 0.0001 or 0.01%. Temporal variability has been discovered for 59 Vir with an indication that circular polarization is also prese nt. A polarization at a level of p similar to 1% was found associated with the star SAO 251015. Marginal polarizations are also suspected fo r the stars HD 155555 and HD 1835. For SAO 154972 (TU Pyx), a sudden c hange in polarization similar to 2% occurred over some tens of minutes and an associated circular polarization was also detected.