Imaging the Circumstellar Envelopes around Evolved Stars with the SMA

Details Imaging the Circumstellar Envelopes around Evolved Stars with the SMA Imaging the Circumstellar Envelopes around Evolved Stars with the SMA

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..344..220h&link_type=abstract

The Cool Universe: Observing Cosmic Dawn, ASP Conference Series, Vol. 344, Proceedings of the conference held 4-8 October, 2004

Astronomy and Astrophysics

Astronomy

Scientific paper

The submillimeter array (SMA) is a powerful instrument to probe the circumstellar structure of evolved stars. High resolution (2--4 arcsec) CO J=2--1 and 3--2 images show that the carbon star V Hya is powering a bipolar molecular jet having an extreme velocity of 70--175 km s-1. The axis of this high velocity jet is perpendicular to the major axis of a flattened disk-like envelope that is expanding with a velocity of ˜16 km s-1. We also obtained excellent images of VY CMa in the CO J=2--1, 13CO J=2--1 and the SO 65--54 lines. The high-resolution images obtained with the SMA show that circumstellar envelopes have unexpectedly complex structure.

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