OPACOS, OVRO post-AGB CO (1-0) emission survey: I - data and derived nebular parameters

Details OPACOS, OVRO post-AGB CO (1-0) emission survey: I - data and derived nebular parameters OPACOS, OVRO post-AGB CO (1-0) emission survey: I - data and derived nebular parameters

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..550s&link_type=abstract

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present interferometric observations of the 12CO (J=1-0) emission in a sample of 27 objects spanning different evolutionary stages from the late Asymptotic Giant Branch (late-AGB), through the pre-planetary nebula (pPN) phase, and to the Planetary Nebula (PN) stage. Observations were performed with the millimeter wavelength array of the Owens Valley Radio Observatory (OVRO). The angular resolution obtained in our survey ranges between 2.3 and 10.7 arcsec. The 13CO and C^18O (J=1-0) transitions as well as the 2.6 mm continuum emission have been also observed in several objects. The detection statistics in the 12CO, {13CO, C^18O transitions and 2.6mm continuum is 89%, 83%, 0%, and 37%, respectively. We report first detection of 12CO (J=1-0) emission in 13 targets and confirm emission from 5 previous marginal detections. Our sample is characterized in its majority by pPNs and young PNs with relatively low far infrared fluxes and, therefore, weak CO emission. The distribution of our targets in the NIR color-color diagram suggests current post-AGB mass-loss in a good fraction. The molecular envelope probed by 12CO (J=1-0) emission is spatially resolved for 18 (out 24) sources; envelope asymmetries and/or velocity gradients are found in most (all?) resolved objects. Our data have been used to derive accurate target coordinates, systemic velocities and to characterize the envelope size, morphology, and kinematics. We also provide an estimate of the total molecular mass and the fraction of it contained in the fast post-AGB flows, a lower limit to the linear momentum, the isotopic 12C/13C ratio, and the AGB mass-loss rate and time scale.

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