The 6.0 and 6.8μm absorption features in the spectrum of NGC 7538: IRS9.

Details The 6.0 and 6.8μm absorption features in the spectrum of NGC 7538: IRS9. The 6.0 and 6.8μm absorption features in the spectrum of NGC 7538: IRS9.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.333s&link_type=abstract

Astronomy and Astrophysics, v.315, p.L333-L336

Astronomy and Astrophysics

Astrophysics

81

Ism: Dust, Extinction, Ism: Molecules, Infrared: Ism: Lines And Bands, Stars: Pre-Main-Sequence, Stars: Individual: Ngc 7538 Irs9

Scientific paper

Short Wavelength Spectrometer observations of the 6.0 and 6.8μm absorption features towards the obscured young stellar object NGC 7538: IRS9 are presented and compared to the features of a number of species measured in the solid phase. It is found that while solid H_2_O provides the bulk of the 6μm band, additional absorption is required near 5.83μm and 6.25μm. It is proposed that formic acid (HCOOH) is a plausible candidate for the blue excess, while the red excess could be related to the C-C stretching mode in aromatic structures. Subsequently, a number of candidates for the 6.8μm band are reviewed. Unfortunately, none of these appears to satisfy the observational constraints and no plausible identification can at this point be presented.

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