Resolution of a fossil dust shell around U Hydrae using maximum entropy image reconstruction

Details Resolution of a fossil dust shell around U Hydrae using maximum entropy image reconstruction Resolution of a fossil dust shell around U Hydrae using maximum entropy image reconstruction

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281l...1w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. L1-L4

Astronomy and Astrophysics

Astronomy

49

Asymptotic Giant Branch Stars, Carbon Stars, Image Reconstruction, Line Spectra, Maximum Entropy Method, Shell Stars, Data Reduction, High Resolution, Infrared Astronomy, Infrared Astronomy Satellite, Stellar Winds

Scientific paper

High resolution image reconstruction techniques applied to the 60 and 100 micrometers data obtained with the InfraRed Astronomical Satellite (IRAS) reveal the presence of a detached ring of dust around the evolved carbon-rich star U Hydrae. The ring is clearly resolved at 60 micrometers but only marginally at 100 micrometers. The 60 micrometer image provides the first direct evidence that the far-IR excess associated with cool carbon stars is due to a previous episode of high mass loss. The age of the fossil shell is estimated at 12,000 yrs and the mass loss rate at 5 10-6 solar mass per year. This is about a factor 25 higher than the present-day mass loss rate. It is concluded that the mass loss rate of carbon stars on the Asymptotic Giant Branch is variable on a timescale that is compatible with the thermal pulse timescale of intermediate mass stars in that evolutionary phase. The Groningen IRAS data reduction system runs within GIPSY and is available to outside users.

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