Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-09-12
Astronomy and Astrophysics
Astrophysics
20 pages (37 kb), AASTex format. Also 9 Postscript figures (388 kB), tarred, compressed and uuencoded, added with 'figure' com
Scientific paper
10.1086/176883
New 3.3--3.6~$\mu$m spectra were obtained of nine young stellar objects embedded in molecular clouds. An absorption feature at $\sim$3.47~$\mu$m (2880~cm$^{-1}$) with FWHM$\sim$0.09 $\mu$m (80 cm$^{-1}$), first identified by Allamandola et al. (1992), was definitively detected toward seven objects, and marginally in the other two. The feature is better correlated with H$_2$O ice than with the silicate dust optical depth in the data obtained to date. Assuming the feature is due to a C--H stretch absorption, the abundance of the C--H bonds averaged along the lines of sight is closely related to that of H$_2$O ice. We interpret the correlation with H$_2$O ice as indicating that the C--H bonds form together with H$_2$O ice on grain surfaces in the molecular clouds, though other formation mechanisms are not ruled out. A second absorption feature at 3.25 $\mu$m (3080 cm$^{-1}$) was detected toward NGC7538/IRS 1 and S140/IRS 1; this feature was first detected in spectra of MonR2/IRS 3 (Sellgren, Smith, \& Brooke 1994; Sellgren et al. 1995). There is as yet insufficient data to tell whether this feature is better correlated with H$_2$O ice or silicates.
Brooke Timothy Young
Sellgren Kris
Smith Gary R.
No associations
LandOfFree
A Study of Absorption Features in the Three Micron Spectra of Molecular Cloud Sources with H$_2$O Ice Bands does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Study of Absorption Features in the Three Micron Spectra of Molecular Cloud Sources with H$_2$O Ice Bands, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Study of Absorption Features in the Three Micron Spectra of Molecular Cloud Sources with H$_2$O Ice Bands will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-457854