Physics – Optics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4302s&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #43.02; Bulletin of the American Astronomical Society, Vol. 32, p.743
Physics
Optics
Scientific paper
We present high-resolution HST/WFPC2 imaging and millimeter-wave line observations with the IRAM 30m telescope, of the bipolar protoplanetary nebula, Frosty Leo (IRAS09371+1212). Our WFPC2 images show the presence of multiple jet-like features in the inner regions of Frosty Leo; substructures within these features indicate temporal variations in the jets. The images reveal a tenuous bipolar bubble-like structure for the extended nebula, and resolve the equatorial waist of the nebula into a flaring edge-on disk. Two bright structures appear embedded within the bubbles on either side of the waist, and are most likely dense-walled, optically-thick cavities. The polar ansae at the tips of the extended bipolar lobes are found to have a knotty, extended morphology suggesting that they are the result of a polar jet which varies both its direction and intensity with time. The CO and 13CO J=1-0 and 2-1 line observations show the presence of slow ( ~ 10 km s-1) and fast ( ~ 50 km s-1) components in the molecular outflow. The ratio of the mechanical momentum in the bipolar outflow to the radiative momentum (L/c) is very large, indicating that the excess momentum may be associated with binarity. Although ground-based adaptive optics imaging apparently shows a binary star at the center of Frosty Leo, the binary separation (190 AU at a minimum distance of 1 kpc) is too large for the formation of an accretion disk which could power collimated outflows. [EOB]
Bujarrabal Valentin
Castro-Carrizo Arancha
Sahai Raghvendra
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