Three-dimensional structure of the circumstellar envelope of CRL 618 based on the CO-13 J = 1-0 mapping observations

Details Three-dimensional structure of the circumstellar envelope of CRL 618 based on the CO-13 J = 1-0 mapping observations Three-dimensional structure of the circumstellar envelope of CRL 618 based on the CO-13 J = 1-0 mapping observations

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..406y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 406-414

Astronomy and Astrophysics

Astronomy

23

Astronomical Models, Asymptotic Giant Branch Stars, Infrared Sources (Astronomy), Planetary Nebulae, Stellar Envelopes, Interferometers, Optical Thickness, Radial Velocity, Radiation Distribution, Space Density, Wavelengths

Scientific paper

The circumstellar envelope of the carbon-rich star CRL 618 has been mapped by the CO-13 J = 1-0 transition with a resolution of about 5.0 sec x 4.3 sec with the Nobeyama Millimeter Array. Emission is extended in size by about 10 sec, and the distribution is approximately spherical. No strong elongation of CO-13 features along or perpendicular to the bipolar axis has been observed. Combining with the CO-12 J = 1-0 data that were taken before, we have created three-dimensional density and temperature profiles of the CRL 618 circumstellar envelope. For creating the three-dimensional model, it is assumed that the expansion velocity is constant and the large-velocity-gradient model is applicable. The former CO-12 observations show that the envelope of CRL 618 consists of complex features. On the basis of the present CO-13 observations, these features are interpreted as the temperature and density irregularities in the outer circumstellar shell. The comparison of the present results with the model density profile given by optical light-scattering maps is made.

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