Formation of condensations in young stellar outflows by a thermal instability

Details Formation of condensations in young stellar outflows by a thermal instability Formation of condensations in young stellar outflows by a thermal instability

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..571d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 571-580. Research supported by CNPq and FAPESP.

Astronomy and Astrophysics

Astrophysics

10

Early Stars, Herbig-Haro Objects, Plasma Jets, Stellar Mass Ejection, H Ii Regions, Molecular Clouds, Radiative Transfer, Thermal Stability

Scientific paper

The formation of condensations (emission-line knots) by thermal instability in ionized outflows from young stellar objects is examined assuming isothermal expanding jets with a temperature of 100,000 K, fluxes of 10 to the -6 to 10 to the -8 solar mass/yr, velocities from 50-400 km/sec, and initial ratios P0(0)/PM0(0) = 0.5 - 10, where P0 is the particle pressure and PM0 is the magnetic pressure. It is shown that the minimum value of P0/PM0 under isobaric conditions for the growth of a thermal instability is (6/5)/9/(5 x radiative cooling time x expansion rate of the ambient plasma flow) - 3/2. Nonlinear calculations under the assumed conditions are performed, and it is found that the collimated flows are thermally unstable to the rapid formation of condensations. It is found that the physical conditions of the observed optical jets reviewed by Mundt et al. (1987) are favorable to the formation of condensations by the thermal instability.

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