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Title: A photoionization model of the nebula around the WC11 star M4-18
Authors: Surendiranath, R
Kameswara Rao, N
Keywords: Radiative Transfer;Stars: Wolf-Rayet;Dust;Extinction;Planetary Nebulae: Individual: M4-18;Infrared: Ism: Continuum
Issue Date: Aug-1995
Publisher: Blackwell Publishing
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 275, No. 3, pp. 685 - 698
Abstract: A photoionization code has been developed incorporating provision for the presence of dust mixed with gas. M4-18 has been modelled utilizing optical CCD spectra and other observations ranging from UV to radio wavelengths. T_e and N_e from the model are 6600K and 6050 cm^-3, respectively. The abundances of C, N and Ne are found to be the same as the solar values while O is overabundant by a factor of two and S is lower than the solar value by ~90 per cent. A mono-sized amorphous carbon grain dust model explains the IRAS fluxes satisfactorily but emits poorly in the 1- to 10-μm region. M4-18 is a protoplanetary nebula with properties similar to CPD - 56 deg8032 and V348 Sgr.
ISSN: 0035-8711
Appears in Collections:IIAP Publications

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