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- W1675429687 abstract "We have investigated the N-type carbon star U Ant in high resolution IRAS images. We nd that the star shows two extended dust shell components and that these two shells are also clearly present in the original survey scan data. Wehavettedadoubledustshellmodelwithsphericalsym- metry to the data to obtain the physical quantities of the shells. The inner dust shell component is related directly to the de- tached gas envelope detected in the mm-wave CO lines in pre- vious studies, while the outer shell has an inner radius of about 3' but has no CO counterpart. The projected separation of the inner edges of the two shells, which is insensitive to any of the model parameters, is derived to be 141-148. Our results to- gether with the CO observations show that the mass loss rate varies by two orders of magnitude along the AGB evolution. We are able to deduce the distance, interpulse period, core mass, and luminosity of the star selfconsistently, assuming that the two detached shells are related directly to two consecutive thermal pulses along the AGB evolution of this star. They are 324pc, 1.010 4 years, 0.80M, and 9.410 3 L for the rst thermal pulse stage, and 436pc, 1.410 4 years, 0.77M, and 1.710 4 Lforthefullamplitudethermalpulsestage,assuming an expansion velocity of 21 km s 1 for both shells. The implied progenitormassofU Antis3-5M.Thismethodcanbeapplied to other AGB stars with a multiple dust shell to be detected in future observations, which provides a way to determine reliable physical quantities of AGB stars." @default.
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- W1675429687 date "1997-07-01" @default.
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- W1675429687 title "A DOUBLE DUST SHELL SURROUNDING THE CARBON STAR U ANTLIAE" @default.
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