Biology
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996asbi.work...44w&link_type=abstract
Astrobiology Workshop: Leadership in Astrobiology, p. A44-A45
Biology
Protostars, T Tauri Stars, Orion Nebula, Massive Stars, A Stars, B Stars, Stellar Evolution, Planetary Evolution, Ratios, Millimeter Waves, Infrared Radiation, Imaging Techniques
Scientific paper
At this stage, the title means observations of the formation and evolution of disks around young stars and protostars. The reality of disks is certain, with the imaging of Beta Pic and the HST pictures of ionized disks around a large percentage of stars in the Orion Nebula. Evidence about these structures around the youngest objects, especially those that are embedded, is more indirect. Infrared excesses from T Tauri stars (which are, of course, visible) imply so much dust that it must be in a flattened distribution to let out the starlight. Infrared excesses are detected at wavelengths as long as millimeter waves. Roughly half the classical T Tauri stars show this emission and have, by implication, disks. The strength of this emission implies masses as large as 0.1 Msun. The slightly more massive Ae/Be stars show similar statistics. Among the most deeply embedded stars, disks are less frequent, suggesting development of the disks as part of the emersion from the dense clouds.
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