Mathematics – Logic
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997abos.conf..267m&link_type=abstract
Conference Paper, Astronomical and Biochemical Origins and the Search for Life in the Universe, IAU Colloquium 161, Publisher: B
Mathematics
Logic
T Tauri Stars, Star Formation, Biological Evolution, Stellar Envelopes, Protostars, Stellar Evolution, Infrared Stars, Solar Corona
Scientific paper
For life to develop, planets are a necessary condition. Likewise, for planets to form, stars must be surrounded by circumstellar disks, at least some time during their premain sequence evolution. Much progress has been made recently in the study of young solar-like stars. In the optical domain, these stars are known as T Tauri stars. A significant number show IR excess, and other phenomena indirectly suggesting the presence of circumstellar disks. The current wisdom is that there is an evolutionary sequence from protostars to T Tauri stars. This sequence is characterized by the initial presence of disks, with lifetimes about 1-10 Myr after the initial collapse of a dense envelope having given birth to a star. While they are present, about 30 percent of the disks have masses larger than the minimum solar nebula.
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