Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..437d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 437-446.
Astronomy and Astrophysics
Astrophysics
19
Near Infrared Radiation, Nebulae, Stellar Envelopes, Asymptotic Giant Branch Stars, Carbon Monoxide, Mie Scattering, Polarimetry, Stellar Luminosity, Stellar Structure
Scientific paper
Results are presented of a comparison of high-resolution NIR polarimetric images of the bipolar nebula IRAS 09371 + 1212 (the 'Frosty Leo') with a scattering model. The observations confirm the recent identification of the Frosty Leo as a bipolar post-AGB circumstellar envelope. The region has a rather complex substructure with several asymmetric features; the tilt angle of the disk is wavelength dependent. An explanation of the envelope structure is proposed, consistent with all available IR and CO data, according to which the bulk of the matter seen in the infrared is a shell ejected during a brief recent phase in which the central star had enhanced mass loss and luminosity, while the larger scale structure is associated with the normal and quieter mass loss phenomenon.
Dougados Catherine
Forveille Thierry
Lacombe Francois
Rouan Daniel
Tiphene Didier
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