The H II region surrounding LK H-alpha 101 and small-scale structure in the nearby atomic hydrogen

Details The H II region surrounding LK H-alpha 101 and small-scale structure in the nearby atomic hydrogen The H II region surrounding LK H-alpha 101 and small-scale structure in the nearby atomic hydrogen

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..275d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. 275-285.

Astronomy and Astrophysics

Astrophysics

14

Early Stars, H Alpha Line, H Ii Regions, Hydrogen Atoms, Nebulae, Stellar Spectra, Astronomical Maps, Atmospheric Ionization, Continuous Radiation, Gray Scale, Line Spectra

Scientific paper

New VLA observations of the H II region surrounding Lk H-alpha 101 and of the fine-scale structure in the extended H I cloud associated with the region are presented. The H II region measures about 0.3 pc in overall diameter, comprises 0.09 solar mass, and shows evidence of a substantial density gradient. The H I emission is characterized by a prominent ridge on the north side of the H II region and by numerous clumps of emission extending to radii between 1 and 2 pc. This distance is significantly less than the radius of the total H I cloud as revealed by lower resolution observations and may represent the extent of the penetration of the UV-driven dissociation front into dense molecular concentrations. Close to the star the advancement of the dissociation into such clumps may be abetted by the process of 'multiple pumping' in the Lyman bands. This process also accounts for the formation of a substantial H I zone around a relatively young H II region. The expected shocked shell of H I outside the ionization boundary was not detected.

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