Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...743...36p&link_type=abstract
The Astrophysical Journal, Volume 743, Issue 1, article id. 36 (2011).
Astronomy and Astrophysics
Astronomy
1
Astrochemistry, Circumstellar Matter, Ism: Molecules, Radio Lines: Stars, Stars: Individual: Nml Cyg, Supergiants
Scientific paper
Millimeter-wave observations of HCO+ have been conducted toward oxygen-rich circumstellar envelopes, as well as IRC+10216, using the facilities of the Arizona Radio Observatory (ARO). The J = 1 → 0 and 2 → 1 transitions of this molecule were measured with the ARO 12 m antenna, while the J = 3 → 2 and 4 → 3 lines were observed using the ARO Sub-Millimeter Telescope. HCO+ was detected toward the supergiant NML Cyg and the asymptotic giant branch (AGB) stars IK Tau, TX Cam, and W Hya in at least two transitions. The J = 2 → 1 and 3 → 2 lines of this ion were also detected toward IRC+10216, confirming the identification of HCO+ in this object. The line profiles measured for HCO+ toward NML Cyg consist of red- and blueshifted components, suggesting a non-spherical shell. Based on a radiative transfer analysis, the abundances in the O-rich envelopes were f(HCO+/H2) ~ 0.15-1.3 × 10-7, with the AGB stars typically exhibiting the higher values. In IRC+10216, f(HCO+/H2) ~ 4.1 × 10-9, lower than the O-rich counterparts. The abundances of HCO+ were also found to peak at considerable distances from the star, indicative of an outer envelope molecule. Comparison with H2O and CO, the main precursor species, suggests that HCO+ is more prevalent in envelopes that have substantial water, but CO also plays a role in its formation. The abundance of HCO+ appears to increase inversely with mass-loss rate, provided the rate is >10-6 M &sun; yr-1. The common appearance of HCO+ in circumstellar gas indicates that, at some level, ion-molecule reactions influence the chemistry of evolved stellar envelopes.
Edwards Luke J.
Pulliam Robin L.
Ziurys Lucy M.
No associations
LandOfFree
Circumstellar Ion-Molecule Chemistry: Observations of HCO+ in the Envelopes of O-rich Stars and IRC+10216 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 Circumstellar Ion-Molecule Chemistry: Observations of HCO+ in the Envelopes of O-rich Stars and IRC+10216, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circumstellar Ion-Molecule Chemistry: Observations of HCO+ in the Envelopes of O-rich Stars and IRC+10216 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1892149