Abstracts » Zoology and wildlife conservation

Finding circumstellar disks

Article Abstract:

Several young stars are surrounded by circumstellar disks that may be giving rise to planetary systems similar to the Solar System that surrounds the Sun. V. Piirola and colleagues analyzed high-resolution polarimetric data from two stars, V376 Cas and V633 Cas and concluded from the polarization of starlight that both have circumstellar disks. In addition, F. Menard and P. Bastien used similar techniques to confirm that 30 other young intermediate- and solar-mass stars likewise have disks.

Planetary rings

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Circumstellar disks deduced from sub-arcsecond polarization observations of two young stars

Article Abstract:

Two young stars, V376 Cassiopeiae (V376 Cas) and V633 Cas, are surrounded by circumstellar disks that may be protoplanetary structures that will eventually coalesce into planetary systems resembling the Solar System. The existence of the circumstellar disks was inferred from data obtained by imaging polarimetry. V376 Cas's disk is optically thick whereas V633 Cas has a comparatively compact disk. Both these stars are Herbig Ae/Be objects with intermediate solar masses of 3 to 5.

Circumstellar matter

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Early stages of star formation

Article Abstract:

Discovery of protostellar cores, which are gas and dust condensed in molecular clouds before stars are formed, will help scientists in assessing dust and molecular line emitted from star forming complexes at high sensitivity and high angular resolution. The wave interferometers at Owners Valleys, Hat Creek and Nobeyama Radio Observatory helped in locating statistically important samples of 'missing links' during star formation.

Usage, Interferometers

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