Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..339p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 339-355. NSF-supported research.
Astronomy and Astrophysics
Astronomy
44
H Ii Regions, Infrared Sources (Astronomy), Nebulae, Pre-Main Sequence Stars, Calcium, Early Stars, H Lines, Iron, Line Spectra, Paschen Series
Scientific paper
High-resolution r, i, and z CCD pictures (6700 - 9000 Å) of the core source of the young stellar object S106/IRS 3 are discussed. Velocity-resolved spectra in the region of the calcium infrared triplet (≡λ8500) and the Paschen-7 line of H I are presented for S106/IRS 3 and GL 490. Consideration of the sizes and ionizations of the various emission zones in S106/IRS 3 leads to the idea of a set of concentric emission rings of low-excitation material or dust that encircle the central ionizing source. High-energy photons flow out along the rotation axis and excite the bipolar H II region, but are very effectively prevented from ionizing and dispersing the dense sheet of dust and gas that bisects the H II region.
Campbell Bel
McGregor Peter J.
Persson Eric S.
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