The molecular envelope around 89 Herculis.

Details The molecular envelope around 89 Herculis. The molecular envelope around 89 Herculis.

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...303l..21a&link_type=abstract

Astronomy and Astrophysics, v.303, p.L21

Astronomy and Astrophysics

Astrophysics

10

Circumstellar Matter, Stars: Agb And Post-Agb, Stars: Individual: 89 Her

Scientific paper

We present high-resolution 12CO J=1-0 maps of the post-AGB star 89 Her, obtained with the IRAM interferometer at Plateau de Bure. The cartography reveals the presence of two distinct shells. The outer one is very clumpy and placed at distances from the star between 4 and 6x10^16^cm (for a distance to 89 Her of 600pc). The inner one has an outer radius of about 10^16^cm. It is found that the outer/inner shell emission mainly correspond to the wing/core component of the CO line profile. We deduce an approximate molecular gas mass of 2x10^-4^ and 6x10^-5^M_sun_ for the outer and inner circumstellar structures respectively. The CO envelope properties are compared with those derived from previous attempts to model the circumstellar dust emission from 89 Her.

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