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The Circumstellar Environment of LkHα 234

Published online by Cambridge University Press:  04 August 2017

B. A. Wilking
Affiliation:
Physics Department, U. of Missouri-St. Louis, St. Louis, Missouri 63121, USA
L. G. Mundy
Affiliation:
Caltech, Pasadena, CA 91125, USA
R. D. Schwartz
Affiliation:
Physics Department, U. of Missouri-St. Louis, St. Louis, Missouri 63121, USA

Extract

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We present high resolution (HPBW = 5 arcsec) continuum and molecular-line observations of the circumstellar environment of the emission-line star LkHα 234 made with the Owens Valley Millimeter-Wave Interferometer. These 98 GHz observations have revealed an unresolved continuum source coincident with the star and a 10 000 by 17000 A.U. ridge of enhanced CS(2-1) emission which peaks ∼ 4″ east of the star. The resulting spectral dependence for the radio continuum emission of ν1.5 is most easily interpreted as arising from a partially ionized stellar wind. Attempts are made to describe the properties of the CS emission in terms of a rotating molecular disk which would link LkHα 234 with large scale mass loss activity in the cloud. However, it appears most likely that the CS emission is arising from a dense (n(H2) ∼ 106 cm −3) condensation of gas adjacent to, but not dynamically associated with, the star.

Type
I. Star Forming Processes in the Solar Neighborhood
Copyright
Copyright © Reidel 1987