Infrared recombination line profiles - A diagnostic probe of the velocity field in the S106 stellar wind

Details Infrared recombination line profiles - A diagnostic probe of the velocity field in the S106 stellar wind Infrared recombination line profiles - A diagnostic probe of the velocity field in the S106 stellar wind

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..611g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 1, 1986, p. 611-617. SERC-supported research.

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Hydrogen Recombinations, Infrared Spectra, Stellar Winds, Velocity Distribution, H Ii Regions, Optical Thickness, Photosphere, Stellar Envelopes, Stellar Evolution

Scientific paper

The velocity profiles of the Brackett-alpha and Pfund-gamma hydrogen recombination lines towards the young exciting star of the S106 bipolar H II region are presented. Both profiles show the presence of velocities on the order of 200 km/s within the ionized circumstellar envelope. However, the respective profiles are distinctly different in shape; the Pf-gamma profile is asymmetric and possesses a strong blue wing, whereas the Br-alpha profile exhibits mirror-image symmetry with respect to the line center. It is inferred that at the higher velocities both lines are at least partially optically thick. The asymmetry in the Pf-gamma profile may arise as a result of either obscuration by the stellar photosphere or the presence of a bipolar wind geometry close to the star. It appears that a decelerating velocity law is appropriate at distances from the star where the optically thick lines originate.

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