Document Type

Article

Publication Date

5-1-2004

Publication Title

The Astrophysical Journal

Volume

606

Issue

2

Publisher

The American Astronomical Society

Abstract

We present a detection of three lines of the H+3 ion in the near-infrared spectrum of the Herbig Be star LkHalpha 101. H+3 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+3 column of (2.2+/-0.3)×1014 cm-2 toward LkHalpha 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 [1×104cm-3

Comments

This manuscript has been published in the Astrophysical Journal. Please find the published version here (note that a subscription is necessary to access this version): http://iopscience.iop.org/0004-637X/606/2/911 The American Astronomical Society holds the copyright in this article.

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