Hydrogen line and continuum emission in young stellar objects. II - Theoretical results and observational constraints

Details Hydrogen line and continuum emission in young stellar objects. II - Theoretical results and observational constraints Hydrogen line and continuum emission in young stellar objects. II - Theoretical results and observational constraints

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..403a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 1, 1989, p. 403-416. Research supported by NASA.

Astronomy and Astrophysics

Astronomy

29

H Lines, Infrared Astronomy, Pre-Main Sequence Stars, Stellar Spectra, T Tauri Stars, Data Correlation, Luminous Intensity, Radio Observation

Scientific paper

Theoretical results for H I emission from YSOs are compared with available observations. IR line and radio continuum properties have been gathered for 29 objects that include a number of T Tau stars, several emission-line stars with IR excesses, and many heavily obscured luminous YSOs. The present excitation model can account for the observed Brackett line and radio continuum fluxes of YSOs with luminosities of 20-100,000 solar luminosities. It is argued that the observed Br-alpha line and 6-cm free-free continuum emissions are best explained in terms of a core-halo structure. The small core (ranging from r less than about 30 AU for a 10,000-solar luminosity YSO to r less than about 0.2 AU for a 10-solar luminosity YSO) is responsible for generating the strong IR line fluxes, while the surrounding diffuse halo dominates the 6-cm emission.

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