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Anomalously Broad Diffuse Interstellar Bands and Excited CH+ Absorption in the Spectrum of Herschel 36

Published online by Cambridge University Press:  21 February 2014

D. G. York ,
J. Dahlstrom ,
D. E. Welty ,
T. Oka ,
L. M. Hobbs ,
S. Johnson ,
S. D. Friedman ,
Z. Jiang ,
B. L. Rachford  and
T. P. Snow
...Show all authors
D. G. York
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA The Enrico Fermi Institute, The University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637, USA
J. Dahlstrom
Affiliation:
Carthage College, 2001 Alford Park Dr., Kenosha, WI 53140, USA
D. E. Welty
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA
T. Oka
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA The Enrico Fermi Institute, The University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637, USA University of Chicago, Dept. of Chemistry, 5735 S. Ellis Ave., Chicago, IL 60637, USA
L. M. Hobbs
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA
S. Johnson
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA
S. D. Friedman
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
Z. Jiang
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA
B. L. Rachford
Affiliation:
Embry-Riddle Aeronautical University, Dept. of Physics, 3700 Willow Creek Rd., Prescott, AZ 863011, USA
T. P. Snow
Affiliation:
The University of Colorado, CASACampus Box 389, Boulder, CO 80309, USA
R. Sherman
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA
P. Sonnentrucker
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
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Abstract

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Anomalously broad diffuse interstellar bands (DIBs) at 5780.5, 5797.1, 6196.0, and 6613.6 Å are found in absorption along the line of sight to Herschel 36, an O star system next to the bright Hourglass nebula of the Hii region Messier 8. Excited lines of CH and CH+ are seen as well. We show that the region is very compact and itemize other anomalies of the gas. An infrared-bright star within 400 AU is noted. The combination of these effects produces anomalous DIBs, interpreted by Oka et al. (2013, see also this volume) as being caused predominantly by infrared pumping of rotational levels of relatively small molecules.

Keywords

ISM: lines and bandsISM: moleculesLine: profilesStars: individual: Herschel 36

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