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Disklike Structure in the Semiregular Pulsating Star X Her

Published online by Cambridge University Press:  15 December 2006

Jun-ichi Nakashima
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan Department of Astronomy, University of Illinois at Urbana-Champaign, 1002, W. Green St., Urbana, IL 61801, USA email: [email protected]
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Abstract

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The author presents the results of Berkeley-Illinois-Maryland (BIMA) array interferometric observations in the CO $J=1$–0 line toward X Her and EP Aqr, semiregular pulsating stars with a composite CO line profile, and also reports finding a disklike structure in X Her. In the CO spectrum both of X Her and EP Aqr, a composite profile including narrow and broad components is seen as reported by the previous single-dish observations. The spatial structure of the broad component region of X Her shows a bipolar shape, and that of the narrow component shows an elliptical/spherical shape. The blue- and red-shifted parts of the X Her narrow component show a systematic difference in the velocity integrated intensity map. The spatio-kinematic properties of the X Her narrow component are reminiscent of a Keplerian rotating disk with a central mass of 0.9 M$_{\odot}$. The spatial distributions of both the narrow and the broad components of EP Aqr appear to be roughly round with the same peak positions; no significant velocity gradient is seen. The spatio-kinematic properties of EP Aqr are reminiscent of a multiple-shell structure model rather than of a bipolar flow and disk model.

Type
Contributed Papers
Copyright
© 2006 International Astronomical Union