Time-dependent bow shocks and the condensation structure of Herbig-Haro objects

Details Time-dependent bow shocks and the condensation structure of Herbig-Haro objects Time-dependent bow shocks and the condensation structure of Herbig-Haro objects

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..193r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 193-210.

Other

48

Bow Waves, Condensing, Herbig-Haro Objects, Shock Waves, Stellar Models, Stellar Structure, H Alpha Line, Pre-Main Sequence Stars, Stellar Evolution, Thermal Instability, Time Dependence

Scientific paper

Some Herbig-Haro objects show a structure which appears to look like a bow shock, but also show a number of 'condensations' superposed on this bow-shaped structure. In the case of HH 1 and HH 2 considerably different proper motions have been measured for the individual condensations. It is, however, very hard to explain why the condensations remain so close to each other if they are indeed separate entities. In this paper it is shown that an interpretation of the whole Herbig-Haro object as a single, time-dependent bow shock provides a natural explanation for the occurrence of condensations (which in numerical calculations appear to be associated with thermal instabilities in the postshock flow) with different proper motions. To this effect, time-dependent, axisymmetric, nonadiabatic bow shock models have been developed from which predictions were obtained for spatially resolved H-alpha intensity maps, and then these predictions are compared qualitatively with observations of a few Herbig-Haro objects.

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