Submillimeter molecular line observations of IRC +10216: Searches for MgH, SiH2, and HCO(+), and detection of hot HCN

Details Submillimeter molecular line observations of IRC +10216: Searches for MgH, SiH2, and HCO(+), and detection of hot HCN Submillimeter molecular line observations of IRC +10216: Searches for MgH, SiH2, and HCO(+), and detection of hot HCN

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426..737a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 426, no. 2, p. 737-741

Physics

12

Interstellar Matter, Line Spectra, Molecular Energy Levels, Molecular Spectra, Spectral Emission, Spectrum Analysis, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Abundance, Detection, Hydrogen, Magnesium Compounds, Silicon Compounds, Stellar Physics

Scientific paper

Sensitive searches have been carried out under good observing conditions for submillimeter-wavelength lines of MgH and SiH2 in the circumstellar envelope of IRC +10216. Upper limits for the column densities are N(MgH-24) equal to or less than 6 x 1012/sq cm and N(SiH2) equal to or less than 3.5 x 1015. A deep search has also been made without success for HCO(+). The upper limit for the column density is N(HCO(+)) equal to or less than 1.4 x 1011/sq cm, which corresponds to X(HCO(+)) = 1.8 x 10-11 for a mass-loss rate of 4 x 10-5 solar mass/yr. This is an order of magnitude lower than the predicted theoretical abundance of X(HCO(+)) = 4.5 x 10-10 (Glassgold et al. 1987). The J = 4-3 rotational lines have been observed from four vibrational states of HCN, all with higher excitation energies than have previously been reported. These are the (0330), (111d0), (1200), and (011d1) states, with excitation energies of 3000, 4000, 5100, and 5800 K, respectively. The line profiles are narrower than that of the HC(15)N ground-state line which was observed simultaneously. This suggests the hot HCN emission is not cospatial with the lower excitation lines.

Affiliated with

Also associated with

No associations

Rating

Submillimeter molecular line observations of IRC +10216: Searches for MgH, SiH2, and HCO(+), and detection of hot HCN 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 Submillimeter molecular line observations of IRC +10216: Searches for MgH, SiH2, and HCO(+), and detection of hot HCN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Submillimeter molecular line observations of IRC +10216: Searches for MgH, SiH2, and HCO(+), and detection of hot HCN will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-885022