The deep 3.4 μm interstellar absorption feature toward the IRAS 18511+0146 cluster
Abstract
Context. An absorption feature at 3.4 μm, widely observed in the diffuse interstellar medium (ISM), is produced by aliphatic hydrocarbon dust. In the local ISM there is in general a linear correlation between the 3.4 μm optical depth and the visual extinction AV. However, the 3.4 μm optical depth toward the young stellar object
Methods: Spectra covering 2.9-4.1 μm were recorded using the near-infrared imager/spectrograph (NIRI) at the Gemini North telescope.
Results: After subtraction of the superimposed 3.47 μm band, produced in dense interstellar gas associated with the cluster, we have determined optical depths of 0.06-0.08 for the 3.4 μm absorption on the three lines of sight. We discuss the distance and extinction to the
Conclusions: The most probable distance to the
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 2012
- DOI:
- 10.1051/0004-6361/201117197
- Bibcode:
- 2012A&A...537A..27G
- Keywords:
-
- methods: observational;
- techniques: spectroscopic;
- infrared: ISM;
- ISM: lines and bands;
- dust;
- extinction;
- stars: individual: IRAS 18511+0146