Direct diagnosis of infall in collapsing protostars. I - The theoretical identification of molecular species with broad velocity distributions

Details Direct diagnosis of infall in collapsing protostars. I - The theoretical identification of molecular species with broad velocity distributions Direct diagnosis of infall in collapsing protostars. I - The theoretical identification of molecular species with broad velocity distributions

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..471r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 1, 1992, p. 471-485.

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141

Gravitational Collapse, Interstellar Chemistry, Line Spectra, Molecular Ions, Protostars, Stellar Envelopes, Ammonia, Line Shape, Stellar Models, Velocity Distribution

Scientific paper

Chemical models, including depletion onto grains, are developed for the collapsing envelopes of protostars in order to identify molecular species having broad velocity distributions so that observations of their line profiles can be employed to diagnose the dynamics of the protostar formation and to yield information on the collapse age and depletion rate. Results from the present model indicate that the collapse initiates very soon after the formation of an isothermal pressure-balanced sphere. It is demonstrated that as depletion reduces the fractional abundance of NH3 in the accelerating gas of an infalling envelope and prevents the formation of broad wings on NH3 emission lines, the fractional abundances of some other species initially increase as the heavy elements become depleted, causing those species to have emission lines broader than those of NH3.

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