Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7365l&link_type=abstract
HST Proposal ID #7365
Computer Science
Hst Proposal Id #7365 Stellar Ejecta
Scientific paper
We propose to utilize the unique capabilities of HST/NICMOS to carry out a study of the near-infrared properties for several proto-planetary and young planetary nebulae. Objects of this class display a number of enigmatic features that have prevented a full understanding of post-asymptotic giant branch stellar evolution. Because of their unique status and important location on the HR diagram, it is critical that the properties of proto-planetary and young planetary nebulae be understood. Because molecular hydrogen emission can probe both shocks {and therefore winds and jets} and the photodissociation region through ultraviolet-pumped near-infrared emission, several objects will be carefully imaged in molecular hydrogen. We will also image an object in carbon monoxide emission. Near-infrared carbon monoxide emission likely arises from a warm circumstellar disk {as in young stellar objects}, but the presence of such a disk needs to be confirmed. Several deep broadband images will be acquired to examine clumping and departures from perfect symmetry. We intend to place our understanding of these objects into the bigger picture of post-asymptotic giant branch evolution through complementary HST/NICMOS observations of several related objects. These data will be tied into ongoing ground-based near- and mid-infrared observational efforts.
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