Volume 377, Number 3, October III 2001
|Page(s)||994 - 998|
|Section||Stellar structure and evolution|
|Published online||15 October 2001|
Detection of the unusual 3.5 μm feature in the Herbig Be star MWC 297
Subaru Telescope, National Astronomical Observatory of Japan, Hilo, Hawaii 96720, USA
2 National Astronomical Observatory, Mitaka, Tokyo, 181-8588, Japan
3 Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
Corresponding author: H. Terada, email@example.com
Accepted: 20 August 2001
We present spectroscopic observations of MWC 297 with medium spectral resolution in the 2.1-4.1 μm region, that show the unusual emission band at 3.53 μm as well as gaseous emission lines of the Brackett, Pfund and Humphrey series of hydrogen. A unique aspect of the measured 3.53 μm emission band is the fact that, within our detection limit, it is not accompanied by the 3.3 and 3.4 μm emission band. We suggest that the 3.53 μm feature could be emitted by highly dehydrogenized carbonaceous dust particles that were processed under the influence of the strong radiation field of the central star.
Key words: infrared: stars / ISM: dust, extinction / stars: individual: MWC 297 / stars: circumstellar matter
© ESO, 2001
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