Grain Formation in the Expanding Envelopes of T Tauri Stars

Details Grain Formation in the Expanding Envelopes of T Tauri Stars Grain Formation in the Expanding Envelopes of T Tauri Stars

Apr 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pthph..49.1152n&link_type=abstract

Progress of Theoretical Physics, Vol. 49, No. 4, pp. 1152-1165

Physics

3

Scientific paper

The possibility of the nucleation in the expanding envelopes of T Tauri stars is investigated by using the nucleation theory by Becker and Döring. The nucleation time scale τn in the gas is investigated assuming that only graphite is condensable. The expansion time scale τexp of the gas ejected from a T Tauri star is calculated assuming that the gas flow is steady and spherically symmetric. The time scale τn is compared with τexp for XC=10-2 (XC is the concentration of carbon by mass) assuming that the gas expands adiabatically, and the massloss rate needed for nucleation is found to be larger than those observed in T Tauri stars. This suggests that nucleation around T Tauri stars is rather difficult.

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