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• W2020449905 abstract "We present a detection of three lines of the H ion in the near-infrared spectrum of the Herbig Be star LkHα 101. H is the principal initiator of gas-phase chemistry in interstellar clouds and can be used to constrain the ionization rate or the path length through interstellar material along the line of sight. Essentially all of the observed H column of (2.2 ± 0.3) × 1014 cm-2 toward LkHα 101 originates in the same dense, dark cloud; less than 1 mag of the ~11 total magnitudes of visual extinction is attributable to diffuse material. Constraints on the density [1 × 104 cm-3 < n(H2) < 4 × 104 cm-3], along with estimates of distances to the obscuring cloud, imply H2 ionization rates of 6.7 × 10-17 s-1 < ζ < 2.7 × 10-16 s-1. The nondetection of fluorescent H2 emission at the cloud surface implies that the obscuring dark cloud is located at least 20 pc from LkHα 101 and is therefore decoupled from its evolution. The confirmation of significant H in dense material addresses earlier concerns that H may originate in diffuse material surrounding dense clouds." @default.
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• W2020449905 date "2004-05-10" @default.
• W2020449905 modified "2023-10-03" @default.
• W2020449905 title "Interstellar H₃⁺Line Absorption toward LkHα 101" @default.
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• W2020449905 doi "https://doi.org/10.1086/383024" @default.
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