Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..36...23r&link_type=abstract
The Messenger, No. 36, P.23, 1984
Physics
3
Scientific paper
In 1933, Paul W. Merrill, of the Mount Wilson Observatory, Published, with the collaboration of Cora Burweil (Merrill and Burwell, 1933), a Catalogue of such attractive objects as the Band Astars that display emission lines in their spectra. The classical model for the Be stars suggests that we are dealing with evolved (off the main sequence) objects and that the emisson arises because of a geometrical effect in the flat, extended envelope that surrounds them. This envelope would result from the shedding of matter through the equatorial bulge because of instability generated by the large rotational velocities that seemed to characterize our group of objects. Such a model is, however, vulnerable in many aspects, as recent studies, particularly those that cover the satellite ultraviolet wavelength region, have disclosed. Indeed, the apparent correlation of rotational velocity and emission is no longer an established fact, the mass loss rate does not seem to be related with velocity of rotation, and it does not seem to be necessarily true that the emission is observed because of a geometrical effect. The investigation of Be.and Ae stars, in as an extended a wavelength range as possible is, therefore, most desirable if we wish to reach a full understanding of their nature and of the structure and extent of their gaseous envelope.
Ringuelet Adela E.
Sahade Jorge
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