Maps of the Molecular Emission Around 18 Evolved Stars
Abstract
We present maps at resolution of the molecular emission around 18 evolved stars (14~asymptotic giant branch stars, one supergiant, two proto-planetary nebulae and one planetary nebula), mostly in the CO(3-2) line. Almost all molecular envelopes appear to be at least marginally resolved at this resolution. A substantial fraction of the molecular envelopes show clear deviations from spherical symmetry in the form of elliptical or bipolar envelopes. This indicates that there is a need to implement non-spherical mass loss in current scenarios of the late stages of stellar evolution, in particular on the asymptotic giant branch.
Keywords
Cite
@article{arxiv.astro-ph/9412008,
title = {Maps of the Molecular Emission Around 18 Evolved Stars},
author = {K. Z. Stanek and G. R. Knapp and K. Young and T. G. Phillips},
journal= {arXiv preprint arXiv:astro-ph/9412008},
year = {2009}
}
Comments
28 pages, uses aaspp.sty file, submitted to ApJ. The full PostScript version with 19 figures can be obtained by the anonymous ftp from astro.princeton.edu, directory stanek/CO_maps, or through the WWW, htpp://astro.princeton.edu/~library/prep.html