Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.1101s&link_type=abstract
American Astronomical Society Meeting 203, #11.01; Bulletin of the American Astronomical Society, Vol. 35, p.1220
Astronomy and Astrophysics
Astronomy
Scientific paper
The process that triggers and drives jet-like winds beyond the Asymptotic Giant Branch (AGB), which is reponsible for the shaping of planetary and protoplanetary nebulae (PNe and PPNe), remains very poorly known. We present echelle long-slit optical spectra (obtained with ESI on Keck II) of a sample of young PPNe/PNe candidates selected from our on-going optical+NIR imaging and CO mapping surveys (with HST and the Owens Valley Radio Observatory, OVRO, millimeter array, respectively). Most of the observed sources show broad H alpha wings ( ˜500-2000 kms-1) that indicate that the jet-sculpting of the AGB envelope has already started and is most likely currently active. In many cases, fast, post-AGB winds are also revealed by P-Cygni profiles close to the central star, providing a unique way of directly studying "pristine" post-AGB ejections (before they are altered by the interaction with the AGB envelope). These observations provide important information on the spatio-kinematic structure and physical conditions of the extended, shocked lobes and the pristine post-AGB winds (probed by the blue-shifted absorption features) as well as the connection between both components in a large sample of young PPNe and PNe. From the detailed analysis of these data (and data from our HST and OVRO surveys) we aim at improving our understanding of post-AGB winds and their interaction with the AGB envelopes.
Gil de Paz Amando
Goodrich Robert W.
Sahai Raghvendra
Sanchez Contreras Carmen
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