The Search for Velocity Structure in the Diffuse Interstellar Bands toward Herschel 36

Details The Search for Velocity Structure in the Diffuse Interstellar Bands toward Herschel 36 The Search for Velocity Structure in the Diffuse Interstellar Bands toward Herschel 36

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.5903d&link_type=abstract

American Astronomical Society Meeting 205, #59.03; Bulletin of the American Astronomical Society, Vol. 36, p.1439

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from a search for velocity structure in the Diffuse Interstellar Bands (DIBs) toward the star Herschel 36. This study utilizes high S/N data taken as part of a larger DIB survey using the echelle spectrograph at the Apache Point Observatory 3.5-m telescope. Herschel 36 is a young 07.5 star located in M8 (The Lagoon Nebula), and the line of sight has a large ratio of total to selective extinction indicating the presence of larger than average interstellar dust grains. The atomic sodium and potassium lines in the spectrum indicate the presence of two major absorbing components in the line of sight, separated in velocity by nearly 60 km/s. Using this known velocity separation, we are studying the DIBs present in the spectrum to look for evidence of the same velocity structure in these unidentified, weak absorption bands. If separate velocity components can be seen in the DIBs toward this star, it may be possible to use known physical conditions in the line of sight to place constraints on the nature of some of the diffuse band carriers. We will incoporate into the discussion new FUSE results on the velocity structure of the molecular hydrogen in the line of sight as well.

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