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Polarimetry of the young Herbig AE star HD 139614. Differences of polarimetric behaviour of Vega-type stars
We present optical polarimetric data of the Herbig Ae star HD 139614 anddiscuss its behaviour relative to similar stars. In spite of a low levelof polarization (~ 0.05-0.2%), polarimetric variability on a time-scaleof days was detected during a four night synoptic study. The differencein the level of the polarization for HD 139614 relative to other HerbigAe/Be stars such as HD 141569, HD 142666 and HD 169142 might be due tothe inclinations and viewing aspects of their circumstellar disks and totheir different evolutionary stages. This hypothesis is consistent withthe photometric behaviour of these stars, their v sin i values andspectral energy distribution in the near and far IR.
| The nearby 2-solar mass BOK globule LBN 11 - Sub-sonic molecular clumps in a magnetic environment
A multiwavelength study of the nearby small Bok globule LBN 11 isperformed in order to investigate the relationship between embeddedmagnetic fields, cloud structure, and star formation. Opticalpolarimetry of background stars is used to characterize and trace theembedded magnetic field direction. High-dispersion CO isotopic mappingis employed to determine the radial density distribution of the gas,measure cloud rotation, and identify individual gas clumps. CS and SOmapping revealed dense cores within the (C-13)O clumps. Analysis ofcoadded IRAS images reveal the cloud to be free of current or recentstar formation: there are no IR point sources of sufficient flux orproper colors to signify young stars associated with the cloud. Themolecular line maps show the cloud to be extremely clumpy. Clumps arefound to range in size from 0.2 pc for the largest CO clump to about0.04 pc for the smallest CS feature. It is concluded that, at least inthe envelope of the cloud, the magnetic field and the CO clumps arecoupled.
| Stromgren and H-beta photometry of stars earlier than G0 in 5 areas containing high latitude molecular clouds
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1989A&AS...80..127F&db_key=AST
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