Very Large Array Observations of Circumstellar Envelopes in the H I 21-cm Line

Details Very Large Array Observations of Circumstellar Envelopes in the H I 21-cm Line Very Large Array Observations of Circumstellar Envelopes in the H I 21-cm Line

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541602j&link_type=abstract

American Astronomical Society, AAS Meeting #215, #416.02; Bulletin of the American Astronomical Society, Vol. 42, p.266

Astronomy and Astrophysics

Astronomy

Scientific paper

The H I 21-cm line is a powerful tool for probing the circumstellar envelopes of asymptotic giant branch (AGB) stars, as it is able to trace envelope kinematics up to 1 pc from the star and thus envelope interactions with the interstellar medium (ISM). We present Very Large Array D-configuration 21-cm line data of the circumstellar envelopes of three AGB stars, X Her, R Peg, and Y UMa. H I emission had previously been detected in single-dish observations of all three stars. The observed envelope morphologies are complex and diverse. X Her's envelope appears to be swept back into a "cometary” tail by motion through the ISM; R Peg displays an arc- or "horseshoe"-like shape; and Y UMa has an "s"-shaped envelope. The detected H I envelopes have extents of 0.1-1 pc and masses of 0.8 x 10-3 to 6 x 10-3 MSun. These new results strengthen earlier indications that circumstellar envelope morphologies can be significantly influenced by their environments, and may have implications for the morphologies displayed by planetary nebulae. This project was supported through an NSF/REU grant at MIT Haystack Observatory.

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